1 = male
2 = female

1 = UK
2 = Europe
3 = USA
4 = China
5 = India

1 = School/FEcollege
2 = mature
3 = overseas
4 = other
5 = access

0 = A*
1 = A
2 = B
3 = C
4 = D
5 = E
6 = F

0 = did not study A-level maths
1 = studied A-level maths
2 = other higher maths e.g. IB

0 = no A-level psychology
1 = A-level psychology

Science A-levels? (excluding psychology, including biology or maths)
0 = no science A-levels
1 = at least one science A-level

1 = state school
2 = private school

0 = state school - comprehensive
1 = state school - grammar
2 = private

0 = state school comprehensive
1 = state school grammar
2 = private
3 = FE college

1 = low (rating of 1 2 or 3)
2 = high (rating of 5 6 or 7)