Mother's employment-sociodemographic
0 = No
1 = Yes

Education level-sociodemographic
1 = dropout
2 = highschool/elementary
3 = completedhighschool

Child's sex-sociodemographic
1 = boy
2 = girl

Preschool attendance-sociodemographic
0 = no
1 = yes

Mother's marital status-sociodemographic
0 = single
1 = boyfriend
2 = cohabiting with the boyfriend

Relatives living with the child-sociodemographic
0 = mother-grandparents
1 = mother-father
2 = mother-father-grandparents