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. Author manuscript; available in PMC: 2023 Feb 1.
Published in final edited form as: Environ Int. 2022 Jan 13;160:107054. doi: 10.1016/j.envint.2021.107054

Table 1.

Population characteristics for the 202 mother-son pairs included in the study and recruited between 2003 and 2006.

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.

a

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).

b

Categorized according to the World Health Organization definitions.

c

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.