Table 1

Baseline characteristics of the study population of the E3N cohort (N=79 806)

All (N=79 806)Passive smoking in childhoodPassive smoking in adulthood
No (N=68 996)Yes (N=10 810)No (N=36 999)Yes (N=42 807)
Age at baseline (years)47.8 (43.6–53.5)47.9 (43.5–53.6)47.4 (43.2–53.0)49.3 (44.1–55.3)46.9 (43.1–52.0)
Body mass index (kg/m²)
 <18.5 kg/m²1738 (2.2)1523 (2.2)215 (2.0)745 (2.0)993 (2.3)
 18.5–25 kg/m²65 255 (81.8)56 506 (81.9)8749 (80.9)30 332 (82.0)34 923 (81.6)
 25–30 kg/m²10 737 (13.5)9203 (13.3)1534 (14.2)5047 (13.6)5690 (13.3)
 ≥30 kg/m²2076 (2.5)1764 (2.6)312 (2.9)875 (2.4)1201 (2.8)
Educational level
 <High school12 025 (15.1)10 195 (14.7)1830 (16.9)5952 (16.1)6073 (14.1)
 Up to 2-level university40 306 (50.5)34 743 (50.4)5563 (51.5)20 549 (55.5)19 757 (46.2)
 3/4-level university27 475 (34.4)24 058 (34.9)3417 (31.6)10 498 (28.4)16 977 (39.7)
Smoking status
 Current smoker11 328 (14.2)9734 (14.1)1594 (14.7)2269 (6.1)9059 (21.2)
 Non-smoker43 170 (54.1)37 917 (55.0)5253 (48.6)23 322 (63.1)19 848 (46.4)
 Former smoker25 308 (31.7)21 345 (30.9)3963 (36.7)11 408 (30.8)13 900 (32.4)
Diabetes mellitus575 (0.7)487 (0.7)88 (0.8)286 (0.8)289 (0.7)
  • Baseline was the date of the first questionnaire (1990). Results are expressed as N (%) for categorical variables and median (IQR) for continuous variables. No missing data.

  • E3N, Etude Epidémiologique auprès des femmes de la Mutuelle générale de l’Education Nationale.