Parity (1=Prim; 2=Mult)
1 = Primiparous (1)
2 = Multiparous (2)

Spanish
1 = Spanish
2 = Not Spanish

Education mother
1 = I can read and write, but I did not go to school. (1)
2 = Incomplete elementary studies (2)
3 = Elementary school (3)
4 = High school (4)
5 = High school senior or vocation training (5)
6 = University degree or university diploma (6)
7 = Higuer university studies or higher technical studies (7)
8 = Others (8)

Marital status mother
1 = 1. De facto or married
2 = 2. Separated or divorced
3 = 3. Single
4 = 4. Widow

Coexistence with the partner
1 = 1. Yes, all the time.
2 = 2. Some days of the month.
3 = 3. No.

IngrFam- income level
1 = 1. Less than 6000 euros.
2 = 2. 6000-8999 euros.
3 = 3. 9000-11999 euros.
4 = 4. 12000 a 17999 euros .
5 = 5. 18000-29999 euros.
6 = 6. 30000-44999 euros.
7 = 7. 45000-60000 euros.
10 = 10. More than 60000 euros.

Z_IngrFamMyP Income level (Mother's lost data, completed with father's data)
1 = 1. Less than 6000 euros.
2 = 2. 6000-8999 euros.
3 = 3. 9000-11999 euros.
4 = 4. 12000 a 17999 euros .
5 = 5. De 18000-29999 euros.
6 = 6. 30000-44999 euros.
7 = 7. 45000-60000 euros.
10 = 10. More than 60000 euros.