Subjects n | Birth weight# | SGA¶ | ||
Coefficient (95% CI) | n (%) | RR (95% CI) | ||
Cotinine ng·mL−1 | ||||
<4 | 875 | Ref: 3384.11 g | 68 (7.8) | Ref: 1.00 |
4–20 | 633 | -1.05 (-39.44–37.33) | 52 (8.3) | 1.03 (0.73–1.46) |
20–50 | 236 | -20.99 (-75.28–33.30) | 25 (10.6) | 1.21 (0.78–1.87) |
>50 | 475 | -143.67 (-186.93– -100.41) | 73 (15.5) | 1.80 (1.30–2.47) |
SHS exposure+ | ||||
No | 781 | 1.09 (-43.98–46.17) | 60 (7.8) | 0.82 (0.56–1.19) |
Only outside the home | 533 | -0.74 (-49.08– 47.60) | 38 (7.2) | 0.73 (0.48–1.11) |
Inside the home | 425 | Ref: 3369.72 g | 46 (10.9) | Ref: 1.00 |
RR: relative risk; ref: reference. #: adjusted for sex (ref: male) and gestational age (centred to 40 weeks), maternal asthma, education (ref: university), social class (ref: non-manual,), parity (ref: nulliparous), and height, weight and age (all centred to mean). ¶: adjusted for maternal education (ref: university), social class (ref: non-manual, only available for INMA cohort), parity (ref: nulliparous), and height, weight and age (all centred to mean). +: if cotinine <50 ng·mL−1 or not reporting active smoking.