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Table 1 Sample description

From: Parental separation and behaviours that influence the health of infants aged 28 to 32 months: a cross-sectional study

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