Table 1.
Maternal sociodemographic characteristics and health behavior, overall and across-prepregnancy body mass index classes (n = 3208)
| Prepregnancy BMI | ||||||
|---|---|---|---|---|---|---|
| All | Underweight | Normal weight | Overweight | Obesity | p-valuea | |
| n = 3208 | n = 240 | n = 2067 | n = 583 | n = 318 | ||
| % | ||||||
| Maternal age (years) (n = 3208) | ||||||
| 18-24 | 17.0 | 28.6 | 15.9 | 16.2 | 16.9 | <10−3 |
| 25-29 | 32.9 | 34.2 | 32.1 | 34.2 | 34.5 | |
| 30-34 | 31.1 | 26.6 | 33.0 | 30.8 | 22.9 | |
| ≥ 35 | 19.0 | 10.7 | 19.0 | 18.8 | 25.7 | |
| Maternal country of birth (n = 3208) | ||||||
| France (mainland and overseas) | 83.8 | 83.3 | 84.9 | 82.7 | 79.1 | 0.03 |
| Africa | 8.7 | 5.0 | 7.9 | 11.8 | 11.4 | |
| Europa, Asia, America, Oceania | 7.5 | 11.7 | 7.2 | 5.5 | 9.5 | |
| Parity (n = 3208) | ||||||
| 1 child | 43.3 | 48.1 | 45.4 | 37.3 | 37.3 | <10−3 |
| 2 children or more | 56.7 | 51.9 | 54.6 | 62.7 | 62.7 | |
| Marital status (n = 3208) | ||||||
| Married | 47.7 | 42.0 | 47.0 | 51.7 | 49.7 | 0.08 |
| Unmarried | 52.3 | 58.0 | 53.0 | 48.3 | 50.3 | |
| Maternal education (n = 3208) | ||||||
| Primary school | 2.4 | 5.4 | 1.2 | 4.0 | 5.1 | <10−3 |
| Junior high school | 20.7 | 22.6 | 18.5 | 21.8 | 30.7 | |
| High school | 23.6 | 21.2 | 22.5 | 25.7 | 29.5 | |
| University | 53.3 | 50.8 | 57.8 | 48.5 | 34.7 | |
| Maternal occupation (n = 3208) | ||||||
| Farmer, craftswoman, merchant | 2.1 | 2.2 | 2.5 | 0.8 | 2.4 | <10−3 |
| Management profession | 15.6 | 13.0 | 18.5 | 10.6 | 8.2 | |
| Intermediate profession | 47.1 | 44.9 | 46.6 | 51.4 | 43.2 | |
| Manual worker | 7.3 | 6.8 | 7.0 | 6.4 | 10.9 | |
| Unemployed | 6.8 | 4.0 | 5.8 | 9.8 | 10.1 | |
| Missing | 21.1 | 29.1 | 19.5 | 21.0 | 25.2 | |
| Time of return to workb (n = 3208) | ||||||
| <= 4 months | 34.4 | 32.5 | 37.1 | 29.9 | 27.5 | <10−3 |
| ]4 months-6 months] | 12.5 | 14.4 | 13.2 | 10.0 | 11.3 | |
| ]6 months-12 months] | 24.4 | 26.9 | 23.9 | 27.1 | 20.9 | |
| Did not go back at 12 months | 28.7 | 26.2 | 25.9 | 32.9 | 40.3 | |
| Smoking before/during pregnancy (n = 3208) | ||||||
| No smoking before or during | 67.6 | 62.0 | 66.8 | 70.4 | 71.3 | 0.07 |
| Smoking before but not during | 15.7 | 14.8 | 16.7 | 13.5 | 14.1 | |
| Smoking before and during | 16.7 | 23.2 | 16.5 | 16.1 | 14.7 | |
| Alcohol during pregnancy (n = 3198) | ||||||
| No consumption | 93.9 | 94.9 | 93.6 | 94.1 | 93.9 | 0.87 |
| Consumption | 6.1 | 5.1 | 6.4 | 5.9 | 6.1 | |
| Antenatal classes (n = 3205) | ||||||
| Attended | 53.2 | 51.2 | 56.8 | 48.8 | 39.0 | <10−3 |
| Not attended | 46.8 | 48.8 | 43.2 | 51.2 | 61.0 | |
aAdjusted Wald test P-value for comparisons across pBMI classes
bDefined as time when the mother returned to work after birth