1 = ≤30
2 = 31-40
3 = ＞40

1 = male
2 = female

1 = single/divorced/widow/separated
2 = married/cohabitation

1 = bachelor college or below
2 = postgraduate or above

1 = <=40h/week
2 = >40h/week

1 = yes
2 = no