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. 2021 Jun 24;50(5):1428–1429m. doi: 10.1093/ije/dyaa282

Table 2.

Comparison of respondents and non-respondents at 5.5 years among the 4286 eligible children

No. of events/No. in group %a
Respondent at 5.5 years
 Non-respondent at 5.5 years
n = 3083 n = 1203 P-value
Gestational age, weeks
 24-26 379/3083 4.5 143/1203 4.0 0.0003
 27-31 1934/3083 31.1 701/1203 26.2
 32-34 770/3083 64.4 359/1203 69.8
Maternal characteristics at birth
Maternal age at birth, years
 <20 67/3083 1.4 70/1203 5.0 <0 .001
 20-35 2476/3083 80.8 929/1203 79.4
 >35 540/3083 17.8 204/1203 15.6
Mother born in France 2506/3074 84.4 822/1175 72.2 <0 .001
Mother living with a partner 2725/2925 94.1 977/1130 85.8 <0 .001
Parents’ socioeconomic positionb
 Manager 750/2959 26.4 157/1108 15.8 <0 .001
 Professional 704/2959 24.8 168/1108 15.9
 Intermediatec 766/2959 25.4 349/1108 32.3
 Sales and services worker 370/2959 12.0 207/1108 17.5
 Manual worker 315/2959 9.6 157/1108 13.3
 Unknown 54/2959 1.7 70/1108 5.1
Maternal level of education
 Lower secondary 845/2982 26.9 472/1070 42.2 <0 .001
 Upper secondary 616/2982 20.5 258/1070 24.4
 Post-secondary, not tertiary 629/2982 21.6 158/1070 14.5
 Bachelor degree or more 892/2982 31.0 182/1070 18.9
Multiple pregnancy 1079/3083 37.4 366/1203 32.0 0.001
Children characteristics
Male 1638/3083 54.9 621/1203 49.5 0.02
Small-for-gestational aged 1069/3082 34.1 407/1203 33.5 ns
Severe neonatal morbiditiese 376/2936 7.0 140/1130 5.9 ns
Cerebral palsy at 2 years 104/2848 2.4 33/750 2.0 ns

ns: non significant.

a

Weighted percentages.

b

Defined as the highest occupational status between current (or former) occupations of the mother and the father, or mother only if living alone, and based on the Classification of Professions and Socioprofessional Categories, developed by the French National Institute of Statistics and Economic Studies.

c

Intermediate socioeconomic position includes employees from administration and public service, self-employed and students.

d

Defined as birthweight less than the 10th percentile for gestational age and sex based on French intrauterine growth curves (Ego 2016).

e

Defined as severe bronchopulmonary dysplasia or necrotizing enterocolitis stage 2–3 or severe retinopathy of prematurity stage >3 or any of the following severe cerebral abnormalities on cranial ultrasonography: intraventricular haemorrhage grade III or IV or cystic periventricular leukomalacia.