Demographic and somatic data (mean values (+/-1 standard deviations) are given where appropriate)
| Non-smoking group | Smoking group | Difference between groups | 95% CI of difference | |
|---|---|---|---|---|
| Number | 100 | 189 | ||
| Male/female | 54/45 | 95/94 | ||
| Delivery (LSCS %) | 24 | 19 | ||
| Maternal age (years) | 30.3 (5.1) | 27.5 (6.0)*** | 2.78 | 1.40 to 4.16 |
| Gestation (weeks) | 39.5 (1.5) | 39.1 (1.46)1-150 | 0.416 | 0.071 to 0.76 |
| Age at test (h) | 61.6 (24.0) | 56.8 (24.0) | 4.79 | −1.111 to 10.7 |
| Birth weight (kg) | 3.49 (0.41) | 3.20 (0.49)*** | 0.278 | 0.164 to 0.392 |
| Length (cm) | 52.5 (3.1) | 51.3 (3.1)** | 1.24 | 0.48 to 2.00 |
| Occipitofrontal circumference (cm) | 34.8 (1.5) | 34.0 (1.4)*** | 0.752 | 0.385 to 1.12 |
| Chest circumference (cm) | 33.0 (1.5) | 32.2 (1.94)*** | 0.828 | 0.382 to 1.26 |
↵1-150 p 0.01 to 0.05; ** p 0.001 to 0.01; *** p <0.001.