1 = adolescent
2 = adult
3 = senior

0 = Not_employed
1 = Employed

highest achieved educational level
1 = Primary education
2 = Secondary education: vocational track
3 = Secondary education: Technical track
4 = Secondary education: General track
5 = Tertiary education, non university
6 = Tertiary education: University

1 = man
2 = woman

1 = underweight
2 = healthy weight
3 = overgeweight
4 = obesity

1 = lager
2 = secundair
3 = hoger

0 = missing
1 = valid

acc_timeperday < 1080 (FILTER)
0 = Not Selected
1 = Selected

1 = low walk
2 = high walk

1 = low SES
2 = high SES