Grade Q1a
97 = N/A
98 = Invalid
99 = Miss

1 = bratislavský
2 = trnavský
3 = trenčiansky
4 = nitriansky
5 = žilinský
6 = banskobytrický
7 = prešovský
8 = košický

<Programme> Q1b
1 = Základná škola
2 = Špeciálna ZŠ
3 = Osemročné gymnázium
4 = Gymnázium
5 = Stredná odborná škola
6 = Stredné odborné učilište
7 = Odborné učilište

Sex Q3
1 = Female
2 = Male
7 = N/A
8 = Invalid
9 = Miss

Lives at home Mother Q4a
1 = Tick
2 = No Tick
7 = N/A
8 = Invalid

Mother currently doing Q5
1 = Working Full-time
2 = Working Part-Time
3 = Looking for work
4 = Other
7 = N/A
8 = Invalid
9 = Miss

Country of birth Self Q15a_a
1 = <Test Country>
97 = N/A
98 = Invalid
99 = Miss

Language at home Q16
1 = <Test language>
2 = <Other national language>
3 = <Other national dialects>
4 = <Other languages>
97 = N/A
98 = Invalid
99 = Miss

Possessions <Cntry item 1> Q17n
99997 = N/A
99998 = Invalid
xxxn1 = Tick
xxxn2 = No Tick

How many books at home Q19
1 = 0-10 books
2 = 11-25 books
3 = 26-100 books
4 = 101-200 books
5 = 201-500 books
6 = More than 500 books
7 = N/A
8 = Invalid
9 = Miss

Attend <ISCED 0> Q20
1 = No
2 = Yes, one year or less
3 = Yes, more than one year
7 = N/A
8 = Invalid
9 = Miss

Repeat <ISCED 1> Q22a
1 = No, never
2 = Yes, once
3 = Yes, twice or more
7 = N/A
8 = Invalid
9 = Miss

School done little Q24a
1 = Strongly agree
2 = Agree
3 = Disagree
4 = Strongly disagree
7 = N/A
8 = Invalid
9 = Miss

Well with Students Q26a
1 = Strongly Agree
2 = Agree
3 = Disagree
4 = Strongly disagree
7 = N/A
8 = Invalid
9 = Miss

Late for school Q28
1 = None
2 = 1 or 2 times
3 = 3 or 4 times
4 = 5 or more times
7 = N/A
8 = Invalid
9 = Miss

Confident timetable Q31a
1 = Very confident
2 = Confident
3 = Not very confident
4 = Not at all confident
7 = N/A
8 = Invalid
9 = Miss

Lesson interested Q38a
1 = Every lesson
2 = Most lessons
3 = Some lessons
4 = Never or hardly ever
7 = N/A
8 = Invalid
9 = Miss

Change while in <ISCED 1> Q3
1 = No, all <ISCED 1> same school
2 = Yes, changed once
3 = Yes, changed twice or more
7 = N/A
8 = Invalid
9 = Miss

Changed <study programme> since <Grade X> Q5
1 = Yes
2 = No
7 = N/A
8 = Invalid
9 = Miss

Type <Mathematics class> Q6
1 = <high level>
2 = <medium level>
3 = <basic level>
7 = N/A
8 = Invalid
9 = Miss

Pass mark in Maths Q7
1 = At or above <pass mark>
2 = Below <pass mark>
7 = N/A
8 = Invalid
9 = Miss

How long using computers Q3
1 = Less than 1 year
2 = 1 to 3 years
3 = 3 to 5 years
4 = More than 5 years
7 = N/A
8 = Invalid
9 = Miss

Use often at home IC4a
1 = Almost every day
2 = A few times each week
3 = Between 1 pwk & 1 pmn
4 = Less than 1 pmn
5 = Never
7 = N/A
8 = Invalid
9 = Miss

How well start game IC6a
1 = Can do well
2 = Can do with help
3 = Cannot do
4 = Don't know
7 = N/A
8 = Invalid
9 = Miss

Learn Computer IC8
1 = My school
2 = My friends
3 = My family
4 = Taught myself
5 = Others
7 = N/A
8 = Invalid
9 = Miss

Learn Internet IC9
1 = Don't know how to use
2 = My school
3 = My friends
4 = My family
5 = Taught myself
6 = Others
7 = N/A
8 = Invalid
9 = Miss

ISCED Level
1 = ISCED level 1
2 = ISCED level 2
3 = ISCED level 3

ISCED Designation
1 = A
2 = B
3 = C
4 = M

ISCED Orientation
1 = General
2 = Pre-Vocational
3 = Vocational

ISO code country of birth Student
99999970 = N/A
99999980 = Invalid
99999990 = Miss
9999yyy0 = yyy=ISO 3-digit code
xxxn9996 = Born in 'other country'
xxxnyyym = xxxn=PISA country code

Language at home, national
xxxncc = xxxn=PISA country code, cc=national value

Educational level of mother (ISCED)
0 = None
1 = ISCED 1
2 = ISCED 2
3 = ISCED 3B, C
4 = ISCED 3A, ISCED 4
5 = ISCED 5B
6 = ISCED 5A, 6
9 = Missing

Expected educational level of student (ISCED)
0 = None
1 = ISCED 2
2 = ISCED 3B, C
3 = ISCED 3A, ISCED 4
4 = ISCED 5B
5 = ISCED 5A, 6
9 = Missing

Country of birth
1 = Native students
2 = First-Generation students
3 = Non-native students
9 = Missing

Mother White collar/Blue collar classification
1 = ="White Collar high skilled"
2 = ="White Collar low skilled"
3 = ="Blue Collar high skilled"
4 = ="Blue Collar low skilled"
9 = ="Missing"

Family Structure
1 = jeden rodič
2 = nukleárna rodina
3 = zmiešaná rodina
4 = ostatné
9 = Missing

1 = slovenský
2 = maďarský