Table 1 Sample description
Initial variable | % | New categories (*without unknowns) | % |
|---|---|---|---|
Gender n = 30,769 | |||
Boy | 51.3 | – | – |
Girl | 48.7 | ||
Child’s age n = 30,707 | – | ||
≤27 mo | 7.3 | ||
28–32 mo | 88.9 | ||
≥33 mo | 3.8 | ||
Birthweight n = 30,757 | n = 30,757 | ||
< 1000 g | 0.1 | ||
1000–1499 g | 0.6 | ||
1500–1999 g | 1.2 | ||
2000–2499 g | 5.1 | < 2500 g | 7.0 |
2500–2999 g | 19.6 | ≥2500 g | |
3000–3499 g | 39.9 | 93.0 | |
3500–3999 g | 25.0 | ||
4000–4499 g | 5.5 | ||
≥4500 g | 3.0 | ||
BMI (kg/m2) at examination | percentiles | n = 29,120 | |
n = 29,120 | |||
< 13.1 | 1.0 | ||
< 13.9 | 5.0 | ||
< 14.4 | 10.0 | ||
< 15.2 | 25.0 | p3-p97 | 91.8 |
< 16.0 | 50.0 | >p97 | 6.3 |
< 17.0 | 75.0 | <p3 | 1.9 |
< 18.0 | 90.0 | ||
< 18.7 | 95.0 | ||
< 20.9 | 99.0 | ||
Mother’s age in years at childbirth n = 29,883 | n = 29,883 | ||
9–15 | 0.2 | ||
16–17 | 0.7 | < 18 | 0.9 |
18–24 | 18.3 | 18/30 | 59.0 |
25–30 | 40.8 | 31/37 | 33.0 |
31–37 | 32.9 | ≥38 | 7.1 |
38–44 | 6.9 | ||
45–53 | 0.2 | ||
Mother’s level of education n = 30,769 | n = 24,530 | ||
Did not complete primary school/no schooling | 2.3 | 22.4 | |
Completed primary school/did not complete lower secondary | 4.3 | < Upper secondary school | 30.8 |
Completed lower secondary school | 11.2 | Completed upper secondary school | 46.8 |
Completed upper secondary school | 24.6 | Completed third-level/university or not | |
Completed third-level/university or not | 37.3 | ||
Unknown | 20.3 | ||
Mother’s occupation n = 15,038 (2006–9) | n = 7293 | ||
Unemployed/stay-at-home | 18.5 | Unemployed/stay-at-home | |
Part time | 9.9 | ||
Early retirement/invalidity/work incapacity | 1.0 | Early retirement/work incapacity/invalidity | 38.1 |
On full-time career break/parental leave or similar | 1.2 | Student | 2.1 |
Student | 0.1 | Works full time or part time/career break/parental leave | 0.3 |
Works full time | 17.7 | 59.5 | |
Unknown | 51.6 | ||
Family income n = 15,038 (2006–9) | n = 7285 | ||
No stable income | 0.6 | ||
1 or 2 incomes from benefits | 5.5 | No stable income | 1.2 |
1 income from employment | 16.3 | 1or 2 incomes from benefits | 11.4 |
1 income from employment + 1 | 0.1 | 1 income from employment | 33.6 |
income from benefits | 0.3 | 2 incomes, of which ≥1 income from employment | 53.8 |
Other (specify) | 26.0 | ||
2 incomes from employment | 51.2 | ||
Unknown | |||
Mother’s standard of French n = 16,990 (2006–9) | |||
None | 1.8 | ||
A little | 8.1 | ||
Very good | 86.9 | ||
Unknown | 3.2 | First language n = 28,582 (2006–12) | |
Language spoken at home n = 13,783 (2010–12) | |||
Language other than French | 34.3 | French | 77.6 |
French | 53.8 | Other | 22.4 |
Unknown | 11.9 | ||
Goes to a nursery n = 13,783 (2010–12) | n = 12,040 | ||
Yes | 48.8 | ||
No | 38.5 | Yes | 55.9 |
Unknown | 12.7 | No | 44.1 |
Family environment n = 30,769 | n = 28,871 | ||
Parents separated | 7.5 | ||
Only sees one parent | 1.3 | ||
Stepfamily | 0.4 | Parents separated/only sees one parent/stepfamily | 9.8 |
Children’s home/home/foster home | 0.6 | Parents together | 90.2 |
Grandparents, uncles/aunts, others | 0.6 | ||
Parents together | 84.6 | ||
Unknown | 5.0 |