Table 1.
Characteristics | Distribution | |
---|---|---|
n (%) | Median [25th, 75th centiles] | |
Center of recruitment | ||
Nancy | 103 (51.0%) | |
Poitiers | 99 (49.0%) | |
Season of conception | ||
January-March | 44 (21.8%) | |
April-June | 41 (20.3%) | |
July-September | 57 (28.2%) | |
October-December | 60 (29.7%) | |
Maternal active smoking in the 3 months preceding pregnancy and during pregnancy | ||
Did not smoke | 127 (62.9%) | |
Smoked before pregnancy | 19 (9.4%) | |
Smoked before and during pregnancy | 26 (12.9%) | |
Othera | 30 (14.9%) | |
Parity | ||
Nulliparous | 88 (43.6%) | |
≥ 1 child | 114 (56.4%) | |
Maternal level of education | ||
< 2 years after high school | 93 (46.0%) | |
high school + 2 years | 43 (21.3%) | |
≥ high school + 3 years | 66 (32.7%) | |
Maternal pre-pregnancy BMI b | ||
Underweight (< 18.5 kg/m2) | 19 (9.4%) | |
Normal weight (≥ 18 - < 25 kg/m2) | 135 (66.8%) | |
Overweight and obesity (≥ 25 kg/m2) | 48 (23.8%) | |
Maternal age (years) | 29.1 [25.6;33.0] | |
Gestational age at delivery (weeks) c | 40.0 [38.9;41.0] |
Abbreviations: BMI = body mass index. LMP = last menstrual period.
Category “Other” referred to women that smoked at some point during pregnancy (during 1 or 2 out of 3 trimesters) but not during the whole pregnancy, or to women that smoked before pregnancy and at some point during pregnancy but not during the whole pregnancy (e.g., women who smoked in the 3 months preceding pregnancy and during the first trimester but quit smoking afterwards).
Categorized according to the World Health Organization definitions.
Based on the date of the LMP or gestational duration assessed by the obstetrician if it differed from the LMP-based estimate by more than 2 weeks.