Gender
1 = Female
2 = Male

Maths Self-Efficacy - Using a <Train Timetable>
1 = Very confident
2 = Confident
3 = Not very confident
4 = Not at all confident
7 = N/A
8 = Invalid
9 = Missing

Sense of Belonging - Feel Like Outsider
1 = Strongly agree
2 = Agree
3 = Disagree
4 = Strongly disagree
7 = N/A
8 = Invalid
9 = Missing

Immigration status
1 = Native
2 = Second-Generation
3 = First-Generation
7 = N/A
8 = Invalid
9 = Missing

9997 = N/A
9998 = Invalid
9999 = Missing