Adjudicated sub-region
82610 = United Kingdom: England, Wales & Northern Ireland
05699 = Belgium: French & German regions (not adjudicated)

OECD country
0 = Non-OECD
1 = OECD

Number of boys Q1a
9997 = N/A
9998 = Invalid
9999 = Missing

Public or private Q2
1 = Public
2 = Private
7 = N/A
8 = Invalid
9 = Missing

Grade 1 Q4a
1 = Yes
2 = No
7 = N/A
8 = Invalid
9 = Missing

Repeat <grade> at <ISCED2> Q5a
996 = N/A
9997 = N/A
9998 = Invalid
9999 = Missing

Size <test lang> classes <modal 15 year old grade> Q6
1 = 15 students or fewer
2 = 16-20 students
3 = 21-25 students
4 = 26-30 students
5 = 31-35 students
6 = 36-40 students
7 = 41-45 students
8 = 46-50 students
9 = More than 50 students
97 = N/A
98 = Invalid
99 = Missing

School community Q7
1 = Village
2 = Small town
3 = Town
4 = City
5 = Large city
7 = N/A
8 = Invalid
9 = Missing

Streaming between classes Q8a
1 = For all subjects
2 = For some subjects
3 = Not for any subject
7 = N/A
8 = Invalid
9 = Missing

Fill science teaching vacancy Q10
1 = No vacancies
2 = All positions filled
3 = Not all filled
7 = N/A
8 = Invalid
9 = Missing

Responsibility teacher hire - Principal or teachers Q11a1
1 = Tick
2 = No tick
7 = N/A
8 = Invalid
9 = Missing

Shortage science teachers Q14a
1 = Not at all
2 = Very little
3 = To some extent
4 = A lot
7 = N/A
8 = Invalid
9 = Missing

Parent pressure academic standards Q16
1 = Many parents
2 = Minority of parents
3 = Largely absent
7 = N/A
8 = Invalid
9 = Missing

Schooling available Q18
1 = Two or more schools
2 = One other school
3 = No other schools
7 = N/A
8 = Invalid
9 = Missing

Admittance residence Q19a
1 = Prerequisite
2 = High priority
3 = Considered
4 = Not considered
7 = N/A
8 = Invalid
9 = Missing

Activities <science clubs> Q20a
1 = Yes
2 = No
7 = N/A
8 = Invalid
9 = Miss

Participate job fairs Q23a
1 = Never
2 = Once a year
3 = More than once a year
7 = N/A
8 = Invalid
9 = Missing

Training local business Q24
1 = Not offered
2 = Half or less
3 = More than half
7 = N/A
8 = Invalid
9 = Missing

Curriculum business/industry Q25
1 = No influence
2 = Minor influence
3 = Considerable influence
7 = N/A
8 = Invalid
9 = Missing

Developing science skills Q26
1 = Incidental
2 = Integrated
3 = Focal
7 = N/A
8 = Invalid
9 = Missing

Guidance responsibility Q28
1 = Not applicable
2 = All teachers
3 = Specific teachers
4 = Counsel employed
5 = Counsel visits
7 = N/A
8 = Invalid
9 = Missing

Career guidance Opportunity Q29
1 = Voluntary
2 = Compulsory
7 = N/A
8 = Invalid
9 = Missing

Ability grouping within schools recoded from SC08Q01 and SC08Q02 (2006)
1 = Not for any subjects
2 = For some subjects
3 = For all subjects
7 = N/A
9 = Missing

Size of <test language> class recoded from SC06Q01
97 = N/A
99 = Miss

School ownership
1 = Private independent
2 = Private government-dependent
3 = Public
7 = N/A
8 = Invalid
9 = Missing

School size
99997 = N/A
99998 = Invalid
99999 = Missing

School academic selectivity recoded from SC19Q02 and SC19Q03 (2006)
1 = Not considered
2 = At least one considered
3 = At least one high priority
4 = At least one prerequisite
7 = N/A
9 = Missing

Responsibility for resource allocation index PISA 2006
997 = N/A
999 = Miss

Original stratum
70310 = SVK: nitriansky - basic and vocational schools
44610 = MAC: Private-not-in-Net, Grammar-International, Chinese and English
15810 = TAP: Junior parts of comprehensive high schools
38020 = ITA: Region 13 - Tecnici - large schools
70320 = SVK: presovsky - secondary, high, secondary + high schools
38040 = ITA: Region 04 - Professionali - large schools
38050 = ITA: Region 09 - Licei - large schools+ moderately small
38060 = ITA: Region 02 - Professionali - large schools
38080 = ITA: Region 05 - moderately small schools
38090 = ITA: Region 11 - moderately small schools
38001 = ITA: Region 08 - Licei - large schools + moderately small
70301 = SVK: Bratislavsky - basic and vocational schools
44601 = MAC: Gov, Grammar-International, Chinese and Portuguese
38011 = ITA: Region 06 - Tecnici - large schools
70311 = SVK: nitriansky - secondary, high, secondary + high schools
38021 = ITA: Region 13 - Professionali - large schools
70321 = SVK: presovsky - secondary, technical, sec. + techn. colleges
38051 = ITA: Region 09 - Tecnici - large schools+ moderately small
38002 = ITA: Region 08 - Tecnici - large schools + moderately small
70302 = SVK: Bratislavsky - secondary, high, secondary + high schools
38012 = ITA: Region 06 - Professionali - large schools
70312 = SVK: nitriansky - secondary, technical, sec. + techn. colleges
70322 = SVK: kosicky - basic and vocational schools
38052 = ITA: Region 09 - Professionali - large schools+ moderately small
38062 = ITA: Region 02 - Formazione professionale - census
38072 = ITA: Region 99 - Tecnici - large schools
38082 = ITA: Region 06 - moderately small schools
38003 = ITA: Region 08 - Professionali - large schools + moderately small
70303 = SVK: Bratislavsky - secondary, technical, sec. + techn. colleges
70313 = SVK: zilinsky - basic and vocational schools
38023 = ITA: Region 13 - Formazione professionale - large schools
70323 = SVK: kosicky - secondary, high, secondary + high schools
38033 = ITA: Region 01 - Formazione professionale - census
38043 = ITA: Region 99 - Tecnici - large schools
38053 = ITA: Region 09 - Medie - moderately small schools
38073 = ITA: Region 99 - Professionali - large schools
38093 = ITA: Region 13 - moderately small schools
38004 = ITA: Region 08 - Medie - large schools + moderately small
70304 = SVK: trnavsky - basic and vocational schools
38014 = ITA: Region 06 - Formazione professionale - census
70314 = SVK: zilinsky - secondary, high, secondary + high schools
15814 = TAP: Practical and technical / Working and Learning schools
70324 = SVK: kosicky - secondary, technical, sec. + techn. colleges
38044 = ITA: Region 99 - Professionali - large schools
38064 = ITA: Region 10 - Tecnici - large schools
38084 = ITA: Region 07 - moderately small schools
70305 = SVK: trnavsky - secondary, high, secondary + high schools
48405 = MEX: BAJA CALIFORNIA SUR, Lower Secondary
44605 = MAC: Private-In-Net, Grammar-International, English and Chinese
70315 = SVK: zilinsky - secondary, technical, sec. + techn. colleges
38025 = ITA: Region 12 - Tecnici - large schools + moderately small
38035 = ITA: Region 05 - Tecnici - large schools
38055 = ITA: Region 99 - Tecnici - large schools
38065 = ITA: Region 10 - Professionali - large schools
38075 = ITA: Region 02 - moderately small schools
38095 = ITA: Region 99 - moderately small schools
38006 = ITA: Region 07 - Tecnici - large schools
70306 = SVK: trnavsky - secondary, technical, sec. + techn. colleges
48406 = MEX: BAJA CALIFORNIA SUR, Upper Secondary
38016 = ITA: Region 99 - Tecnici - large schools
70316 = SVK: banskobytricky - basic and vocational schools
38026 = ITA: Region 12 - Professionali - large schools + moderately small
38036 = ITA: Region 05 - Professionali - large schools
38046 = ITA: Region 03 - Licei - large schools + moderately small
38056 = ITA: Region 99 - Professionali - large schools
38007 = ITA: Region 07 - Professionali - large schools
70307 = SVK: trenciansky - basic and vocational schools
38017 = ITA: Region 99 - Professionali - large schools
70317 = SVK: banskobytricky - secondary, high, secondary + high schools
38047 = ITA: Region 03 - Tecnici - large schools + moderately small
70308 = SVK: trenciansky - secondary, high, secondary + high schools
70318 = SVK: banskobytricky - secondary, technical, sec. + techn. colleges
38028 = ITA: Region 12 - Formazione professionale - census
38048 = ITA: Region 03 - Professionali - large schools + moderately small
38068 = ITA: Region 11 - Tecnici - large schools
38078 = ITA: Region 04 - moderately small schools
38088 = ITA: Region 10 - moderately small schools
38009 = ITA: Region 07 - Formazione professionale - large schools
70309 = SVK: trenciansky - secondary, technical, sec. + techn. colleges
70319 = SVK: presovsky - - basic and vocational schools
38039 = ITA: Region 04 - Tecnici - large schools
38049 = ITA: Region 03 - Medie - large schools + moderately small
38059 = ITA: Region 02 - Tecnici - large schools
38069 = ITA: Region 11 - Professionali - large schools