Basic details of study groups
| Non-smoking | Smoking | |
|---|---|---|
| Values are mean (SEM) (range). | ||
| Number of infants | 13 | 11 |
| Gestation (weeks) | 40 (0.3) (38–41) | 40 (0.4) (38–42) |
| Birth weight (g) | 3498 (102) (2765–4015) | 3598 (129) (3015–4190) |
| Apgar at 1 min | 9 (5–10) | 9 (5–10) |
| Apgar at 5 min | 9 (7–10) | 9 (6–10) |
| Maternal age (years) | 28 (2) (18–39) | 32 (2) (26–42) |
| Age at 2–3 week study (days) | 14 (1) (8–19) | 15 (1) (10–21) |
| Weight at 2–3 week study (g) | 3709 (129) (2750–4390) | 3886 (140) (3155–4536) |
| Age at 2–3 month study (days) | 74 (2) (63–83) | 75 (2) (68–84) |
| Weight at 2–3 month study (g) | 5453 (213) (4423–6480) | 5805 (227) (4536–7000) |
| Age at 5–6 month study (days) | 189 (5) (175–213) | 176 (5) (155–200) |
| Weight at 5–6 month study (g) | 7865 (359) (6200–9335) | 7935 (223) (6804–8800) |