Table 1 Comparability of the intervention and control groups, % if not otherwise indicated1)
Intervention | Control | |
|---|---|---|
(n = 845) | (n = 723) | |
Age at birth, mean (SD) | 30.6 (5.5) | 30.6 (5.4) |
< 25 yr | 14 | 13 |
25–29 | 28 | 30 |
30–34 | 30 | 31 |
35 + | 27 | 27 |
Marital status | ||
Married | 52 | 59 |
Common law | 38 | 35 |
Other + NG | 10 | 6 |
Social class | ||
Upper white collar | 27 | 29 |
Lower white collar | 31 | 29 |
Worker | 10 | 9 |
Student | 13 | 12 |
Other + NG | 20 | 20 |
Previous births2), mean (SD) | 0.67 (0.97) | 0.70 (0.98) |
0 | 57 | 55 |
Previous pregnancies2), mean (SD) | 1.07 (1.27) | 1.16 (1.32) |
Smoking2) | ||
No | 84 | 85 |
Current | 14 | 13 |
Quitted (during pregnancy) | 2 | 2 |
Timing of 1st prenatal visit, mean (SD) | 9.0 (3.1) | 9.0 (3.1) |
< 10 gest. weeks | 69 | 68 |
Boy | 53 | 52 |
Twin | 1 | 1 |
Pregnancy length, mean weeks (SD) | 40.1 (1.6) | 40.0 (1.6) |
< 37 | 3 | 3 |
37–41.9 | 89 | 91 |
42+ | 8 | 6 |
Birth weight, mean g (SD) | 3521 (487) | 3522 (537) |
< 2500 | 3 | 4 |
2500–2999 | 9 | 9 |
3000–3499 | 35 | 33 |
3500–3999 | 40 | 36 |
4000+ | 13 | 18 |