PISA Assessment Cycle (2 digits + 2 character Assessment type - MS/FT)

Russian Federation: Republic of Tatarstan

Stratum ID 7-character (cnt + region ID + original stratum ID)

MDA - stratum 10: Russian / Big city / Mixed
MAC - stratum 10: Private-not-in-Net, Grammar-International, Portuguese
MKD - stratum 10: ISCED3/Macedonian/General
BIH - stratum 10: Kanton Sarajevo/ISCED 3
LBN - stratum 10: 10.  MIXED / Public / Rural
FIN - stratum 10: Swedish speaking area - rural
BLR - stratum 10: Rural/Secondary Special Educational
MEX - stratum 10: Upper Secondary / Private / Large
QCY - stratum 10: ISCED3 / Vocational / Public
URY - stratum 10: Public Technical non formal schools/Lower secondary only
ESP - stratum 10: Canary Islands, private
ARE - stratum 10: Abu Dhabi  /  Private / Other
TAP - stratum 10: Regular senior secondary (2)/Private(2)/Urban(1)
TUR - stratum 10: Anatolian High School- C
LTU - stratum 10: Lithuanian / town / basic
KAZ - stratum 10: non-intellectual / Kostanayskaya oblast
FRA - stratum 10: Guadeloupe/Guyane/Martinique Lycée agricole LS       
ALB - stratum 10: Rural / Center / Private
CHE - stratum 10: French, Mixed, Non-Urban
DEU - stratum 10: NOR / Nordrhein-Westfalen (NW)
ITA - stratum 10: Toscana / Centro di Formazione Professionale
CHL - stratum 10: SUBSIDIZED / PRIMARY&SECONDARY / TP
ARG - stratum 10: Córdoba-Private schools
COL - stratum 10: Rest of the Country / Urban-Public
MDA - stratum 20: Mixed / Big city / ISCED2
BIH - stratum 20: Regija Hercegovina/ISCED 3
BEL - stratum 20: Flanders/Special Ed/community
FRA - stratum 20: Mayotte Collège LS    
ARE - stratum 20: Dubai  /  Private / Other
QCI - stratum 20: Shanghai  / City / Academic / ISCED3
TAP - stratum 20: Comprehensive senior secondary (4)/Public(1)/Suburban(2)
TUR - stratum 20: Anatolian Imam and Preacher High School - C
QUK - stratum 20: Wales_independent_Central South Wales
ITA - stratum 20: Trento / Centro di Formazione Professionale
ARG - stratum 20: Patagonia-Private schools
LTU - stratum 20: Other multi-language / NA / NA
BIH - stratum 30: Unsko-sanski kanton/ISCED 3
CZE - stratum 30: Voc-Tech-Conservatory with maturate
TUR - stratum 30: Vocational and Technical Anatolian High School - D
QUK - stratum 30: Northern Ireland_voluntary grammar_North Eastern
ARE - stratum 30: Sharjah  /  Private / Other
TAP - stratum 30: Comprehensive junior-senior high (5)/Private(2)/Rural(3)
ITA - stratum 30: Molise / Centro di Formazione Professionale
ARE - stratum 40: Ajman  /  Private / Other
QCI - stratum 50: Jiangsu  / Rural area / Academic / ISCED3
ARE - stratum 60: Ras Al Khaimah  /  Private / Other
ARE - stratum 70: Fujairah  /  Private / Other
MDA - stratum 01: Romanian / Big city / Mixed
MKD - stratum 01: ISCED2/Macedonian/General
BIH - stratum 01: Bosansko-podrinjski kanton Goražde/ISCED 2
IRL - stratum 01: Community-comp/up to 45
LBN - stratum 01: 1.  ISCED2AG / Public / Urban
FIN - stratum 01: Helsinki/Uusimaa - urban
MAR - stratum 01: Tanger-Tetouan-Al Hoceima
NOR - stratum 01: Lower secondary schools
HRV - stratum 01: Four year vocational programme
MEX - stratum 01: Lower Secondary / Public / Large
QCY - stratum 01: ISCED2 / General / Public
URY - stratum 01: Public General Secondary Schools & Military School/Lower secondary only
SVN - stratum 01: GIMg = gymnasia general
FRA - stratum 01: Métropolitaine Lycée GT LS       
ALB - stratum 01: Urban / North / Public
CHE - stratum 01: German, ISCED 2, Urban Core Area
ARE - stratum 01: Abu Dhabi  /  Public / MoE
QCI - stratum 01: Beijing  / City / Academic / ISCED2
BEL - stratum 01: Flanders/Gen Ed only/private subsidized/ISCED2
CHL - stratum 01: PRIMARY / PRIMARY ONLY
VNM - stratum 01: Northern Vietnam / >50% public funding / Urban
CAN - stratum 01: prov 10 Fr.& Eng. 0,1,2
TAP - stratum 01: Junior high (1)/Public(1)/Urban(1)
KOR - stratum 01: Lower Secondary/General
MYS - stratum 01: MOE National Secondary School/Other States
DEU - stratum 01: NOR / Baden-Württemberg (BW)
LTU - stratum 01: Lithuanian / Capital / Gymnasium
LUX - stratum 01: 1: ESC government-public
KAZ - stratum 01: non-intellectual / Astana city
QAZ - stratum 01: Urban/Azerbaijani/Public
QUK - stratum 01: England_maintained selective_All regions
TUR - stratum 01: Lower-Secondary School
MDA - stratum 11: Russian / Big city / ISCED2
MKD - stratum 11: ISCED3/Macedonian/Mixed
BIH - stratum 11: Regija Banja Luka/ISCED 2
LBN - stratum 11: 11.  MIXED / Private / Urban
MAR - stratum 11: Laayoune-Sakia El Hamra
ISR - stratum 11: Apprenticeship institutions – Hebrew
MEX - stratum 11: Upper Secondary / Private / Moderately small
QCY - stratum 11: ISCED3 / Vocational / Private
URY - stratum 11: Rural Public Schools with Lower Secondary/Lower secondary only
QCI - stratum 11: Beijing  / Town / Vocational / ISCED3
BEL - stratum 11: Flanders/Gen Ed and other type/community/ISCED3
TUR - stratum 11: Anatolian High School- D
LTU - stratum 11: Lithuanian / town / progymnasium
KAZ - stratum 11: non-intellectual / Kyzyl-Ordinskaya oblast
QUK - stratum 11: England_academy_Midlands
THA - stratum 11: OHEC/ISCED2 only & Mixed
FRA - stratum 11: Guadeloupe/Guyane/Martinique MSS
ALB - stratum 11: Rural / South / Public
CHE - stratum 11: French, ISCED 3, Urban Core Area
ARE - stratum 11: Dubai   /  Public / MoE
CAN - stratum 11: prov 11 Fr.& Eng. 0,1,2
DEU - stratum 11: NOR / Rheinland-Pfalz (RP)
BRA - stratum 11: South,Public Municipal
CHL - stratum 11: SUBSIDIZED / SECONDARY / HS
VNM - stratum 11: Southern Vietnam / >50% public funding / Urban
BRN - stratum 11: International Schools / Mixed ISCED
COL - stratum 11: Rest of the Country / Rural-Public
ARG - stratum 11: Santa Fe-Public schools
MDA - stratum 21: Mixed / Big city / ISCED3
BIH - stratum 21: Regija Prijedor/ISCED 2
ISL - stratum 21: Norðurland vestra / 1-8
BEL - stratum 21: Flanders/Part-time Vocational Ed
FRA - stratum 21: Mayotte Lycée PRO LS       
QCI - stratum 21: Shanghai  / City / Academic / Mixed
TAP - stratum 21: Comprehensive senior secondary (4)/Public(1)/Rural(3)
ARE - stratum 21: Sharjah  /  Public / MoE
TUR - stratum 21: Anatolian Imam and Preacher High School - D
QUK - stratum 21: Wales_independent_South East Wales
BIH - stratum 31: Zeničko-dobojski kanton/ISCED 2
CZE - stratum 31: Voc-Tech Secondary without maturate
QCI - stratum 31: Shanghai  / Rural area / Academic / ISCED2
TUR - stratum 31: Vocational and Technical Anatolian High School - E
QUK - stratum 31: Northern Ireland_voluntary grammar_South Eastern
TAP - stratum 31: Five-year junior college (6)/Public(1)/Urban(1)
ARE - stratum 31: Ajman  /  Public / MoE
QCI - stratum 41: Jiangsu  / City / Vocational / ISCED3
ARE - stratum 41: Umm Al Quwain  /  Public / MoE
ITA - stratum 41: Abruzzo / Istituto Tecnico
QCI - stratum 51: Jiangsu  / Rural area / Academic / Mixed
ARE - stratum 51: Ras Al Khaimah  /  Public / MoE
ITA - stratum 51: Marche / Istituto Tecnico
QCI - stratum 61: Zhejiang  / Town / Academic / ISCED2
ARE - stratum 61: Fujairah /  Public / MoE
QCI - stratum 71: Zhejiang  / Rural area / Vocational / ISCED3
MDA - stratum 02: Romanian / Big city / ISCED2
MAC - stratum 02: Government, Grammar-International, Chinese and Portuguese
BIH - stratum 02: Bosansko-podrinjski kanton Goražde/ISCED 3
IRL - stratum 02: Community-comp/46 - 85
LBN - stratum 02: 2.  ISCED2AG / Public / Rural
FIN - stratum 02: Helsinki/Uusimaa - rural
QSC - stratum 02: pub fund-second lowest
NOR - stratum 02: Upper secondary schools
ISR - stratum 02: Hebrew religious-Female
HRV - stratum 02: Vocational-industrial-crafts programme
MEX - stratum 02: Lower Secondary / Public / Moderately small
QCY - stratum 02: Mixed ISCED / General / Public
URY - stratum 02: Public General Secondary Schools & Military School/Mixed
ITA - stratum 02: Bolzano / Istituto Tecnico
CHE - stratum 02: German, ISCED 2, Non-Urban
QCI - stratum 02: Beijing  / City / Academic / ISCED3
BEL - stratum 02: Flanders/Gen Ed only/private subsidized/ISCED3
VNM - stratum 02: Northern Vietnam / >50% public funding / Rural
CAN - stratum 02: prov 10 Fr.& Eng. 3 to 21
BRN - stratum 02: Ministry of Ed / Mixed ISCED
SVN - stratum 02: GIMs = gymnasia specialist
TAP - stratum 02: Junior high (1)/Public(1)/Suburban(2)
LTU - stratum 02: Lithuanian / Capital / basic
LUX - stratum 02: 2: ESG government-public
KAZ - stratum 02: non-intellectual / Almaty city
QAZ - stratum 02: Urban/Azerbaijani/Private
QUK - stratum 02: England_maintained non-selective_North
FRA - stratum 02: Métropolitaine Collège LS       
ALB - stratum 02: Urban / North / Private
SWE - stratum 02: PUB/ LOWER SEC/LARGE CITIES
CHL - stratum 02: MUNICIPAL / PRIMARY&SECONDARY / HS
KOR - stratum 02: Upper Secondary/General
RUS - stratum 02: Republic of Bashkortostan
MYS - stratum 02: MOE Religious School/Other States
TUR - stratum 02: Science High School - A
MDA - stratum 12: Russian / Big city / ISCED3
MKD - stratum 12: ISCED3/Macedonian/Vocational
BIH - stratum 12: Regija Banja Luka/ISCED 3
LBN - stratum 12: 12.  MIXED / Private / Rural
ISR - stratum 12: Apprenticeship institutions – Arabic
PRT - stratum 12: Beiras e Serra da Estrela
MEX - stratum 12: Upper Secondary / Private / Small
QCY - stratum 12: ISCED3 / Mixed / Public
BEL - stratum 12: Flanders/Gen Ed and other type/community/Mixed ISCED
TAP - stratum 12: Regular senior secondary (2)/Private(2)/Rural(3)
TUR - stratum 12: Anatolian High School- E
LTU - stratum 12: Lithuanian / town / other
KAZ - stratum 12: non-intellectual / Mangystauskaya oblast
FRA - stratum 12: Guadeloupe/Guyane/Martinique VSS
ALB - stratum 12: Rural / South / Private
CHE - stratum 12: French, ISCED 3, Non-Urban
CAN - stratum 12: prov 11 Fr.& Eng. 3 to 21
CHL - stratum 12: SUBSIDIZED / SECONDARY / HS-TP
VNM - stratum 12: Southern Vietnam / >50% public funding / Rural
ITA - stratum 12: Sardegna / Istituto Tecnico
COL - stratum 12: Rest of the Country / Private
ARG - stratum 12: Santa Fe-Private schools
BIH - stratum 22: Regija Prijedor/ISCED 3
ISL - stratum 22: Norðurland vestra / 9-16
BEL - stratum 22: French com/Regular/ISCED2
TAP - stratum 22: Comprehensive senior secondary (4)/Private(2)/Urban(1)
QUK - stratum 22: Northern Ireland_controlled grammar_All regions
TUR - stratum 22: Anatolian Imam and Preacher High School - E
ITA - stratum 22: Others / Istituto Tecnico
BIH - stratum 32: Zeničko-dobojski kanton/ISCED 3
QCI - stratum 32: Shanghai  / Rural area / Academic / ISCED3
TUR - stratum 32: Vocational and Technical Anatolian High School - F
QUK - stratum 32: Northern Ireland_voluntary grammar_Southern
TAP - stratum 32: Five-year junior college (6)/Public(1)/Suburban(2)
ITA - stratum 32: Basilicata / Istituto Tecnico
ITA - stratum 42: Abruzzo / Istituto Professionale
RUS - stratum 52: Nizhny Novgorod Region
ITA - stratum 52: Marche / Istituto Professionale
QCI - stratum 62: Zhejiang  / Town / Academic / ISCED3
MDA - stratum 03: Romanian / Big city / ISCED3
MAC - stratum 03: Government, Technical-Vocational, Chinese
HKG - stratum 03: Private or International
BIH - stratum 03: Brčko distrikt/ISCED 2
CRI - stratum 03: Urban public technical
IRL - stratum 03: Community-comp/86 or more
LBN - stratum 03: 3.  ISCED2AG / Private / Urban
FIN - stratum 03: Southern Finland - urban
MEX - stratum 03: Lower Secondary / Public / Small
QCY - stratum 03: Mixed ISCED / General / Private
URY - stratum 03: Public General Secondary Schools & Military School/Upper secondary only
SVN - stratum 03: SSI = technical educational programmes
BRA - stratum 03: North,Public Municipal
ITA - stratum 03: Bolzano / Istituto Professionale
CHE - stratum 03: German, Mixed, Urban Core Area
QCI - stratum 03: Beijing  / City / Academic / Mixed
BEL - stratum 03: Flanders/Gen Ed only/private subsidized/Mixed ISCED
VNM - stratum 03: Northern Vietnam / >50% public funding / Remote area
CAN - stratum 03: prov 10 Fr.& Eng. 22 to 41
BRN - stratum 03: Ministry of Ed/  ISCED 3 only
TAP - stratum 03: Junior high (1)/Public(1)/Rural(3)
LTU - stratum 03: Lithuanian / Capital / progymnasium
LUX - stratum 03: 3: ESC+ESG government-public
KAZ - stratum 03: non-intellectual / Akmolinskaya oblast
QUK - stratum 03: England_maintained non-selective_Midlands
FRA - stratum 03: Métropolitaine Lycée PRO LS       
ALB - stratum 03: Urban / Center / Public
ARG - stratum 03: 24 Dept. of Buenos Aires-Public schools (PBA)
CHL - stratum 03: MUNICIPAL / PRIMARY&SECONDARY / HS-TP
MYS - stratum 03: MOE Technical School/Other States
TUR - stratum 03: Science High School - B
KOR - stratum 03: Upper Secondary/Vocational
MDA - stratum 13: Russian / Urban / Mixed
BIH - stratum 13: Regija Bijeljina/ISCED 2
DOM - stratum 13: Private/Urban & Rural/ISCED3
ESP - stratum 13: Castile and Leon, public
QCI - stratum 13: Beijing  / Rural area / Academic / ISCED2
BEL - stratum 13: Flanders/Tech or Voc/private subsidized/ISCED2
TUR - stratum 13: Anatolian High School- F
LTU - stratum 13: Lithuanian / village / Gymnasium
KAZ - stratum 13: non-intellectual / South-Kazakhstan oblast
QUK - stratum 13: England_academy_Greater London
FRA - stratum 13: La Réunion Lycée GT LS       
CAN - stratum 13: prov 11 Fr.& Eng. 22 to 41
TAP - stratum 13: Skill-based senior secondary (3)/Public(1)/Urban(1)
CHE - stratum 13: Italian, ISCED 2, Urban Core Area
CHL - stratum 13: SUBSIDIZED / SECONDARY / TP
VNM - stratum 13: Southern Vietnam / >50% public funding / Remote area
BRA - stratum 13: Southeast,Public Federal
ITA - stratum 13: Sardegna / Istituto Professionale
MDA - stratum 23: Mixed / Urban / ISCED2
BIH - stratum 23: Regija Sarajevsko-romanijska/ISCED 2
ISL - stratum 23: Norðurland vestra /17-35
QCI - stratum 23: Shanghai  / City / Vocational / ISCED3
BEL - stratum 23: French com/Regular/ISCED3/Academic only
TAP - stratum 23: Comprehensive senior secondary (4)/Private(2)/Suburban(2)
QUK - stratum 23: Northern Ireland_controlled non-grammar_Belfast
TUR - stratum 23: Anatolian Imam and Preacher High School - F
ITA - stratum 23: Others / Istituto Professionale
BIH - stratum 33: Županija posavska/ISCED 2
UKR - stratum 33: Rural/ Ivano-Frankivsk
QCI - stratum 33: Shanghai  / Rural area / Academic / Mixed
TUR - stratum 33: Vocational and Technical Anatolian High School - G
QUK - stratum 33: Northern Ireland_catholic and other maintained_Belfast
TAP - stratum 33: Five-year junior college (6)/Public(1)/Rural(3)
ITA - stratum 33: Basilicata / Istituto Professionale
QCI - stratum 43: Jiangsu  / Town / Academic / ISCED2
ITA - stratum 43: Abruzzo / Scuola media
QCI - stratum 53: Jiangsu  / Rural area / Vocational / ISCED3
QCI - stratum 63: Zhejiang  / Town / Academic / Mixed
MDA - stratum 04: Romanian / Urban / Mixed
MAC - stratum 04: Private-in-Net, Grammar-International, Chinese
BIH - stratum 04: Brčko distrikt/ISCED 3
CRI - stratum 04: Rural public technical
LBN - stratum 04: 4.  ISCED2AG / Private / Rural
FIN - stratum 04: Southern Finland - rural
QSC - stratum 04: pub fund-second highest
BLR - stratum 04: Urban/Prof Tech College
HRV - stratum 04: Art-vocational programme
MEX - stratum 04: Lower Secondary / Private / Large
URY - stratum 04: Private General Secondary Schools/Lower secondary only
SVN - stratum 04: SPI = vocational of medium duration
CHE - stratum 04: German, Mixed, Non-Urban
VNM - stratum 04: Northern Vietnam / <50% public funding / Urban
CAN - stratum 04: prov 10 Fr.& Eng. 42 to …
TAP - stratum 04: Junior high (1)/Private(2)/Urban(1)
DEU - stratum 04: NOR / Brandenburg (BB)
LTU - stratum 04: Lithuanian / Capital / other
LUX - stratum 04: 4: ESG government-private
KAZ - stratum 04: non-intellectual / Aktubinskaya oblast
QUK - stratum 04: England_maintained non-selective_South
FRA - stratum 04: Métropolitaine Lycée agricole LS       
ITA - stratum 04: Bolzano / Scuola media
ALB - stratum 04: Urban / Center / Private
ARG - stratum 04: 24 Dept. of Buenos Aires-Private schools (PBA)
CHL - stratum 04: MUNICIPAL / PRIMARY&SECONDARY / TP
COL - stratum 04: Manizales / Urban-Public
MYS - stratum 04: MOE Fully Residential School
QAZ - stratum 04: Suburban/Azerbaijani/Public
TUR - stratum 04: Science High School - C
KOR - stratum 04: Mixed School Level/General
MDA - stratum 14: Russian / Urban / ISCED2
BIH - stratum 14: Regija Bijeljina/ISCED 3
ESP - stratum 14: Castile and Leon, private
QCI - stratum 14: Beijing  / Rural area / Academic / ISCED3
BEL - stratum 14: Flanders/Tech or Voc/private subsidized/ISCED3
TUR - stratum 14: Anatolian High School- G
LTU - stratum 14: Lithuanian / village / basic
KAZ - stratum 14: non-intellectual / Pavlodarskaya oblast
FRA - stratum 14: La Réunion Collège LS       
CAN - stratum 14: prov 11 Fr.& Eng. 42 to …
TAP - stratum 14: Skill-based senior secondary (3)/Public(1)/Suburban(2)
DEU - stratum 14: NOR / Sachsen-Anhalt (ST)
CHE - stratum 14: Italian, ISCED 2, Non-Urban
VNM - stratum 14: Southern Vietnam / <50% public funding / Urban
QUK - stratum 14: Wales_maintained_North Wales/GwE
BRA - stratum 14: Southeast,Public State
ITA - stratum 14: Sardegna / Scuola media
CHL - stratum 14: PRIVATE / PRIM&SEC , SEC / HS
RUS - stratum 14: Republic of Sakha (Yakutia)
MDA - stratum 24: Mixed / Urban / ISCED3
BIH - stratum 24: Regija Sarajevsko-romanijska/ISCED 3
ISL - stratum 24: Norðurland vestra / >35
PRT - stratum 24: Terras de Trás-os-Montes
BEL - stratum 24: French com/Regular/ISCED3/Mixed
TAP - stratum 24: Comprehensive senior secondary (4)/Private(2)/Rural(3)
QUK - stratum 24: Northern Ireland_controlled non-grammar_Western
TUR - stratum 24: Anatolian Imam and Preacher High School - G
BIH - stratum 34: Županija posavska/ISCED 3
ESP - stratum 34: Basque Country, public, AB
TUR - stratum 34: Vocational and Technical Anatolian High School - H
QUK - stratum 34: Northern Ireland_catholic and other maintained_Western
TAP - stratum 34: Five-year junior college (6)/Private(2)/Urban(1)
ITA - stratum 34: Basilicata / Scuola media
QCI - stratum 44: Jiangsu  / Town / Academic / ISCED3
ITA - stratum 44: Abruzzo / Centro di Formazione Professionale
ITA - stratum 54: Marche / Centro di Formazione Professionale
MDA - stratum 05: Romanian / Urban / ISCED2
MAC - stratum 05: Private-in-Net, Grammar-International, Chinese and English
NLD - stratum 05: 5_PRO/VMBO-BL/KL/GL/TL
BIH - stratum 05: Hercegbosanska županija/ISCED 2
ISL - stratum 05: Nágrenni Reykjavíkur / 1-8
LBN - stratum 05: 5.  ISCED3AG / Public / Urban
FIN - stratum 05: Western Finland - urban
HUN - stratum 05: Vocational secondary school
GEO - stratum 05: Small city and town / Private
BLR - stratum 05: Urban/Secondary Special Educational
SAU - stratum 05: Almadina Almunawareh/FEMALE
MEX - stratum 05: Lower Secondary / Private / Moderately small
URY - stratum 05: Private General Secondary Schools/Mixed
SVN - stratum 05: NPI = vocational of short duration
ITA - stratum 05: Bolzano / Centro di Formazione Professionale
ALB - stratum 05: Urban / South / Public
CHE - stratum 05: German, ISCED 3, Urban Core Area
ARE - stratum 05: Abu Dhabi  /  Public / Other
QCI - stratum 05: Beijing  / City / Vocational / ISCED3
BEL - stratum 05: Flanders/Gen Ed only/community/ISCED3
VNM - stratum 05: Northern Vietnam / <50% public funding / Rural and Remote area
BRN - stratum 05: Ministry of Relig. Aff / Mixed ISCED
TAP - stratum 05: Junior high (1)/Private(2)/Suburban(2)
LTU - stratum 05: Lithuanian / City / Gymnasium
LUX - stratum 05: 5: ESC+ESG government-private
KAZ - stratum 05: non-intellectual / Almatinskaya oblast
QUK - stratum 05: England_maintained non-selective_Greater London
BRA - stratum 05: Northeast,Public Federal
SWE - stratum 05: INDEP/ LOWER SEC/ METRO
ARG - stratum 05: Rest of Buenos Aires-Public schools (PBA)
CHL - stratum 05: MUNICIPAL / SECONDARY / HS
COL - stratum 05: Manizales / Rural-Public
PAN - stratum 05: Non-Regular/Urban/Public
MYS - stratum 05: non-MOE MARA Junior Science College/Other States
QAZ - stratum 05: Suburban/Azerbaijani/Private
TUR - stratum 05: Social Sciences High School - A
MDA - stratum 15: Russian / Urban / ISCED3
MKD - stratum 15: ISCED3/Mixed/Vocational
ESP - stratum 15: Castile – La Mancha, public
QCI - stratum 15: Beijing  / Rural area / Academic / Mixed
BEL - stratum 15: Flanders/Tech or Voc/private subsidized/Mixed ISCED
TUR - stratum 15: Anatolian High School- H
LTU - stratum 15: Lithuanian / village / progymnasium
KAZ - stratum 15: non-intellectual / North-Kazakhstan oblast
FRA - stratum 15: La Réunion Lycée PRO LS
ARE - stratum 15: Dubai  /  Public / Other
TAP - stratum 15: Skill-based senior secondary (3)/Public(1)/Rural(3)
DEU - stratum 15: NOR / Schleswig-Holstein (SH)
VNM - stratum 15: Southern Vietnam / <50% public funding / Rural and Remote area
QUK - stratum 15: Wales_maintained_South West and Mid Wales/ERW
BRA - stratum 15: Southeast,Public Municipal
ITA - stratum 15: Sardegna / Centro di Formazione Professionale
RUS - stratum 15: Republic of North Ossetia - Alania
BIH - stratum 25: Srednjobosanski kanton/Kanton Središnja Bosna/ISCED 2
ISL - stratum 25: Norðurland eystra / 1-8
ESP - stratum 25: Madrid, Bilingual Public
QCI - stratum 25: Shanghai  / Town / Academic / ISCED2
BEL - stratum 25: French com/Regular/ISCED3/Vocational only
QUK - stratum 25: Northern Ireland_controlled non-grammar_North Eastern
ARE - stratum 25: Sharjah  /  Public / Other
TAP - stratum 25: Comprehensive junior-senior high (5)/Public(1)/Urban(1)
TUR - stratum 25: Anatolian Imam and Preacher High School - H
ITA - stratum 25: Others / Centro di Formazione Professionale
BIH - stratum 35: Županija zapadnohercegovačka/ISCED 2
ESP - stratum 35: Basque Country, public, D
TUR - stratum 35: Vocational and Technical Anatolian High School - I
QUK - stratum 35: Northern Ireland_catholic and other maintained_North Eastern
TAP - stratum 35: Five-year junior college (6)/Private(2)/Suburban(2)
ARE - stratum 35: Ajman  /  Public / Other
ITA - stratum 35: Friuli-Venezia Giulia / Liceo
QCI - stratum 45: Jiangsu  / Town / Academic / Mixed
ARE - stratum 45: Umm Al Quwain  /  Public / Other
QCI - stratum 55: Zhejiang  / City / Academic / ISCED2
ARE - stratum 55: Ras Al Khaimah  /  Public / Other
QCI - stratum 65: Zhejiang  / Town / Vocational / ISCED3
ARE - stratum 65: Fujairah  /  Public / Other
RUS - stratum 75: Trans-Baikal Territory
MDA - stratum 06: Romanian / Urban / ISCED3
MAC - stratum 06: Private-in-Net, Grammar-International, English
BIH - stratum 06: Hercegbosanska županija/ISCED 3
ISL - stratum 06: Nágrenni Reykjavíkur / 9-16
LBN - stratum 06: 6.  ISCED3AG / Public / Rural
FIN - stratum 06: Western Finland - rural
SVN - stratum 06: OS = elementary school
GEO - stratum 06: Small city and town / Public
SAU - stratum 06: Almadina Almunawareh/MALE
HRV - stratum 06: Primary schools (lower secondary education)
MEX - stratum 06: Lower Secondary / Private / Small
URY - stratum 06: Private General Secondary Schools/Upper secondary only
CHE - stratum 06: German, ISCED 3, Non-Urban
ARE - stratum 06: Abu Dhabi  /  Private / MoE
BEL - stratum 06: Flanders/Gen Ed only/community/Mixed ISCED
TAP - stratum 06: Junior high (1)/Private(2)/Rural(3)
LTU - stratum 06: Lithuanian / City / basic
LUX - stratum 06: 6: Government independent
KAZ - stratum 06: non-intellectual / Atyrauskaya oblast
QUK - stratum 06: England_independent_North
BRA - stratum 06: Northeast,Public State
ALB - stratum 06: Urban / South / Private
SWE - stratum 06: INDEP/ LOWER SEC/ LARGE CITIES
ARG - stratum 06: Rest of Buenos Aires-Private schools (PBA)
CHL - stratum 06: MUNICIPAL / SECONDARY / HS-TP
VNM - stratum 06: Central Vietnam / >50% public funding / Urban
PAN - stratum 06: Non-Regular/Urban/Private
MYS - stratum 06: non-MOE Other Schools/Other States
QAZ - stratum 06: Suburban/Russian/Public
BRN - stratum 06: Ministry of Relig. Aff /  ISCED 3 only
TUR - stratum 06: Social Sciences High School - B
MDA - stratum 16: Russian / Rural / Mixed
MKD - stratum 16: ISCED3/Albanian/General
ESP - stratum 16: Castile – La Mancha, private
BEL - stratum 16: Flanders/Tech or Voc/community/ISCED2
TUR - stratum 16: Anatolian High School- I
LTU - stratum 16: Lithuanian / village / other
KAZ - stratum 16: non-intellectual / East-Kazakhstan oblast
FRA - stratum 16: La Réunion Lycée agricole LS
ARE - stratum 16: Dubai   /  Private / MoE
TAP - stratum 16: Skill-based senior secondary (3)/Private(2)/Urban(1)
QUK - stratum 16: Wales_maintained_Central South Wales
MDA - stratum 26: Mixed / Rural / ISCED2
BIH - stratum 26: Srednjobosanski kanton/Kanton Središnja Bosna/ISCED 3
ESP - stratum 26: Madrid, Non-Bilingual Public
QCI - stratum 26: Shanghai  / Town / Academic / ISCED3
BEL - stratum 26: French com/Regular/ Mixed ISCED/Academic only
QUK - stratum 26: Northern Ireland_controlled non-grammar_South Eastern
ARE - stratum 26: Sharjah  /  Private / MoE
TAP - stratum 26: Comprehensive junior-senior high (5)/Public(1)/Suburban(2)
TUR - stratum 26: Anatolian Sport High School/ Anatolian Fine Arts High School
BIH - stratum 36: Županija zapadnohercegovačka/ISCED 3
ESP - stratum 36: Basque Country, private, AB
TUR - stratum 36: Multi-Programme Anatolian High School -A
QUK - stratum 36: Northern Ireland_catholic and other maintained_South Eastern
TAP - stratum 36: Five-year junior college (6)/Private(2)/Rural(3)
ARE - stratum 36: Ajman  /  Private / MoE
ITA - stratum 36: Friuli-Venezia Giulia / Istituto Tecnico
ARE - stratum 46: Umm Al Quwain  /  Private / MoE
ITA - stratum 46: Liguria / Istituto Tecnico
QCI - stratum 56: Zhejiang  / City / Academic / ISCED3
ARE - stratum 56: Ras Al Khaimah  /  Private / MoE
ITA - stratum 56: Valle d'Aosta / Istituto Tecnico
ARE - stratum 66: Fujairah  /  Private / MoE
RUS - stratum 86: Khanty-Mansi Autonomous Area – Yugra
MDA - stratum 07: Romanian / Rural / Mixed
MAC - stratum 07: Private-in-Net, Technical-Vocational, Chinese
MKD - stratum 07: ISCED2/Albanian/General
BIH - stratum 07: Hercegovačko-neretvanska županija/kanton/ISCED 2
ISL - stratum 07: Nágrenni Reykjavíkur / 17-35
LBN - stratum 07: 7.  ISCED3AG / Private / Urban
FIN - stratum 07: Northern & Eastern Finland - urban
SVN - stratum 07: IO = adult educational programmes
PRT - stratum 07: Área Metropolitana de Lisboa
MEX - stratum 07: Upper Secondary / Public / Large
URY - stratum 07: Public Technical Secondary Schools/Lower secondary only
ESP - stratum 07: Balearic Islands, public
ALB - stratum 07: Rural / North / Public
ARE - stratum 07: Abu Dhabi  /  Private / US
QCI - stratum 07: Beijing  / Town / Academic / ISCED2
BEL - stratum 07: Flanders/Gen Ed and other type/private subsidized/ISCED2
TAP - stratum 07: Regular senior secondary (2)/Public(1)/Urban(1)
LTU - stratum 07: Lithuanian / City / progymnasium
KAZ - stratum 07: non-intellectual / West-Kazakhstan oblast
QUK - stratum 07: England_independent_Midlands
BRA - stratum 07: Northeast,Public Municipal
FRA - stratum 07: Guadeloupe/Guyane/Martinique Lycée GT LS       
CHE - stratum 07: French, ISCED 2, Urban Core Area
SWE - stratum 07: INDEP/ LOWER SEC/ OTHER
CHL - stratum 07: MUNICIPAL / SECONDARY / TP
VNM - stratum 07: Central Vietnam / >50% public funding / Rural
PAN - stratum 07: Non-Regular/Rural/Public
MYS - stratum 07: Perlis except “MOE Fully Residential Schools”
QAZ - stratum 07: Suburban/Russian/Private
ITA - stratum 07: Toscana / Istituto Tecnico
ARG - stratum 07: Tucumán-Public schools
COL - stratum 07: Medellin / Urban-Public
TUR - stratum 07: Social Sciences High School - C
MDA - stratum 17: Russian / Rural / ISCED2
BEL - stratum 17: Flanders/Tech or Voc/community/ISCED3
TUR - stratum 17: Anatolian High School- J
ARE - stratum 17: Dubai  /  Private / US
TAP - stratum 17: Skill-based senior secondary (3)/Private(2)/Suburban(2)
CHE - stratum 17: Italian, ISCED 3, Urban Core Area
QUK - stratum 17: Wales_maintained_South East Wales
BRA - stratum 17: Middle-West,Public Federal
ITA - stratum 17: Trento / Istituto Tecnico
BIH - stratum 27: Tuzlanski kanton/ISCED 2
ISL - stratum 27: Norðurland eystra / 17-35
ESP - stratum 27: Madrid, Bilingual Private (Publicly Funded)
QCI - stratum 27: Shanghai  / Town / Academic / Mixed
BEL - stratum 27: French com/Regular/ Mixed ISCED/Mixed
TUR - stratum 27: Vocational and Technical Anatolian High School - A
QUK - stratum 27: Northern Ireland_controlled non-grammar_Southern
ARE - stratum 27: Sharjah  /  Private / US
TAP - stratum 27: Comprehensive junior-senior high (5)/Public(1)/Rural(3)
ITA - stratum 27: Molise / Istituto Tecnico
ESP - stratum 37: Basque Country, private, D
TUR - stratum 37: Multi-Programme Anatolian High School -B
QUK - stratum 37: Northern Ireland_catholic and other maintained_Southern
QCI - stratum 37: Jiangsu  / City / Academic / ISCED2
ARE - stratum 37: Ajman  /  Private / US
ITA - stratum 37: Friuli-Venezia Giulia / Istituto Professionale
QCI - stratum 47: Jiangsu  / Town / Vocational / ISCED3
ARE - stratum 47: Umm Al Quwain  /  Private / US
ITA - stratum 47: Liguria / Istituto Professionale
QCI - stratum 57: Zhejiang  / City / Academic / Mixed
ARE - stratum 57: Ras Al Khaimah  /  Private / US
ITA - stratum 57: Valle d'Aosta / Istituto Professionale
QCI - stratum 67: Zhejiang  / Rural area / Academic / ISCED2
ARE - stratum 67: Fujairah  /  Private / US
Undisclosed STRATUM - Republic of Moldova
Undisclosed STRATUM - United Arab Emirates
Undisclosed STRATUM - Bosnia and Herzegovina
Undisclosed STRATUM - Dominican Republic
Undisclosed STRATUM - Russian Federation
MDA - stratum 08: Romanian / Rural / ISCED2
MAC - stratum 08: Private-not-in-Net, Grammar-International, Chinese
BIH - stratum 08: Hercegovačko-neretvanska županija/kanton/ISCED 3
ISL - stratum 08: Nágrenni Reykjavíkur / > 35
LBN - stratum 08: 8.  ISCED3AG / Private / Rural
FIN - stratum 08: Northern & Eastern Finland - rural
UKR - stratum 08: Urban/ Ivano-Frankivsk
ISR - stratum 08: Hebrew Ultra-Orthodox – Female
PRT - stratum 08: Área Metropolitana do Porto
MEX - stratum 08: Upper Secondary / Public / Moderately small
QCY - stratum 08: ISCED3 / General / Public
URY - stratum 08: Public Technical Secondary Schools/Mixed
ESP - stratum 08: Balearic Islands, private
ARE - stratum 08: Abu Dhabi  /  Private / UK
QCI - stratum 08: Beijing  / Town / Academic / ISCED3
BEL - stratum 08: Flanders/Gen Ed and other type/private subsidized /ISCED3
BRN - stratum 08: Private Schools / Mixed ISCED
TAP - stratum 08: Regular senior secondary (2)/Public(1)/Suburban(2)
TUR - stratum 08: Anatolian High School- A
DEU - stratum 08: NOR / Mecklenburg-Vorpommern (MV)
LTU - stratum 08: Lithuanian / City / other
KAZ - stratum 08: non-intellectual / Zhambylskaya oblast
QUK - stratum 08: England_independent_South
FRA - stratum 08: Guadeloupe/Guyane/Martinique Collège LS       
ALB - stratum 08: Rural / North / Private
CHE - stratum 08: French, ISCED 2, Non-Urban
VNM - stratum 08: Central Vietnam / >50% public funding / Remote area
PAN - stratum 08: Non-Regular/Rural/Private
MYS - stratum 08: Wilayah Persekutuan Putrajaya  except “MOE Fully Residential Schools�
ITA - stratum 08: Toscana / Istituto Professionale
ARG - stratum 08: Tucumán-Private schools
CHL - stratum 08: SUBSIDIZED / PRIMARY&SECONDARY / HS
COL - stratum 08: Medellin / Rural-Public
MDA - stratum 18: Russian / Rural / ISCED3
MKD - stratum 18: ISCED3/Albanian/Vocational
PRT - stratum 18: Região Autónoma da Madeira
BEL - stratum 18: Flanders/Tech or Voc/community/Mixed ISCED
ARE - stratum 18: Dubai  /  Private / UK
TAP - stratum 18: Skill-based senior secondary (3)/Private(2)/Rural(3)
CHE - stratum 18: Italian, ISCED 3, Non-Urban
TUR - stratum 18: Anatolian Imam and Preacher High School - A
QUK - stratum 18: Wales_independent_North Wales/GwE
BRA - stratum 18: Middle-West,Public State
ITA - stratum 18: Trento / Istituto Professionale
BIH - stratum 28: Tuzlanski kanton/ISCED 3
ISL - stratum 28: Norðurland eystra / > 35
ESP - stratum 28: Madrid, Non-Bilingual Private (Publicly Funded)
TUR - stratum 28: Vocational and Technical Anatolian High School - B
QUK - stratum 28: Northern Ireland_voluntary grammar_Belfast
ARE - stratum 28: Sharjah  /  Private / UK
TAP - stratum 28: Comprehensive junior-senior high (5)/Private(2)/Urban(1)
ITA - stratum 28: Molise / Istituto Professionale
TUR - stratum 38: Multi-Programme Anatolian High School -C
QUK - stratum 38: Northern Ireland_integrated (controlled integrated and grant maintained
QCI - stratum 38: Jiangsu  / City / Academic / ISCED3
ARE - stratum 38: Ajman  /  Private / UK
ITA - stratum 38: Friuli-Venezia Giulia / Scuola media
ITA - stratum 48: Liguria / Scuola media
ARE - stratum 58: Ras Al Khaimah  /  Private / UK
ITA - stratum 58: Valle d'Aosta / Scuola media
QCI - stratum 68: Zhejiang  / Rural area / Academic / ISCED3
ARE - stratum 68: Fujairah  /  Private / UK
MDA - stratum 09: Romanian / Rural / ISCED3
MAC - stratum 09: Private-not-in-Net, Grammar-International, English
BIH - stratum 09: Kanton Sarajevo/ISCED 2
LBN - stratum 09: 9.  MIXED / Public / Urban
FIN - stratum 09: Swedish speaking area - urban
GEO - stratum 09: Remote village / Public
BLR - stratum 09: Rural/Prof Tech College
ISR - stratum 09: Hebrew Ultra-Orthodox – Male
MEX - stratum 09: Upper Secondary / Public / Small
URY - stratum 09: Public Technical Secondary Schools/Upper secondary only
ESP - stratum 09: Canary Islands, public
ALB - stratum 09: Rural / Center / Public
ARE - stratum 09: Abu Dhabi  /  Private / Indian
QCI - stratum 09: Beijing  / Town / Academic / Mixed
BEL - stratum 09: Flanders/Gen Ed and other type/private subsidized /Mixed ISCED
TAP - stratum 09: Regular senior secondary (2)/Public(1)/Rural(3)
TUR - stratum 09: Anatolian High School- B
DEU - stratum 09: NOR / Niedersachsen (NI)
LTU - stratum 09: Lithuanian / town / Gymnasium
KAZ - stratum 09: non-intellectual / Karagandinskaya oblast
QUK - stratum 09: England_independent_Greater London
FRA - stratum 09: Guadeloupe/Guyane/Martinique Lycée PRO LS       
CHE - stratum 09: French, Mixed, Urban Core Area
SVK - stratum 09: Others / Region 3_VÝCH
VNM - stratum 09: Central Vietnam / <50% public funding / Urban
MYS - stratum 09: Wilayah Persekutuan Labuan except “MOE Fully Residential Schools”
ITA - stratum 09: Toscana / Scuola media
CHL - stratum 09: SUBSIDIZED / PRIMARY&SECONDARY / HS-TP
ARG - stratum 09: Córdoba-Public schools
MDA - stratum 19: Mixed / Big city / Mixed
BIH - stratum 19: Regija Hercegovina/ISCED 2
PRT - stratum 19: Região Autónoma dos Açores
BEL - stratum 19: Flanders/Special Ed/private subsidized
FRA - stratum 19: Mayotte Lycée GT LS       
ARE - stratum 19: Dubai  /  Private / Indian
QCI - stratum 19: Shanghai  / City / Academic / ISCED2
TAP - stratum 19: Comprehensive senior secondary (4)/Public(1)/Urban(1)
TUR - stratum 19: Anatolian Imam and Preacher High School - B
QUK - stratum 19: Wales_independent_South West and Mid Wales/ERW
LTU - stratum 19: Russian, Polish / NA / NA
BRA - stratum 19: Middle-West,Public Municipal
ARG - stratum 19: Patagonia-Public schools
BIH - stratum 29: Unsko-sanski kanton/ISCED 2
BEL - stratum 29: French com/Part-time Vocational Ed
TUR - stratum 29: Vocational and Technical Anatolian High School - C
QUK - stratum 29: Northern Ireland_voluntary grammar_Western
ARE - stratum 29: Sharjah  /  Private / Indian
TAP - stratum 29: Comprehensive junior-senior high (5)/Private(2)/Suburban(2)
TUR - stratum 39: Multi-Programme Anatolian High School -D
QUK - stratum 39: Northern Ireland_independent_All regions
QCI - stratum 39: Jiangsu  / City / Academic / Mixed
ARE - stratum 39: Ajman  /  Private / Indian
ITA - stratum 39: Friuli-Venezia Giulia / Centro di Formazione Professionale
QCI - stratum 49: Jiangsu  / Rural area / Academic / ISCED2
ARE - stratum 49: Umm Al Quwain  /  Private / Indian
ITA - stratum 49: Liguria / Centro di Formazione Professionale
QCI - stratum 59: Zhejiang  / City / Vocational / ISCED3
ARE - stratum 59: Ras Al Khaimah  /  Private / Indian
ITA - stratum 59: Valle d'Aosta / Centro di Formazione Professionale
QCI - stratum 69: Zhejiang  / Rural area / Academic / Mixed
ARE - stratum 69: Fujairah  /  Private / Indian