Characteristics of smoking behaviour and infant cotinine levels in the study population
| Characteristics | Mothers smoked in pregnancy(n = 33) | Mothers did not smoke in pregnancy(n = 54) | p Value† |
|---|---|---|---|
| *p<0.05 between the two groups. | |||
| †Differences between the two groups were determined by the Mann-Whitney U test for non-parametric continuous data. | |||
| ‡Data shown as geometric mean (95% CI) with the number of samples detected above the limit of detection indicated in square brackets. | |||
| Maternal smoking (current) | 33/33 (100.0%) | 54/54 (100.0%) | |
| Median (IQR) pack-years | 8.81 (3.46, 13.34) | 0.00 (0.00, 2.30) | <0.001* |
| Infant urine cotinine (ng/mg)‡ | 29.8 (16.4 to 54.4)[10/31] | 12.2 (10.0 to 14.9)[4/54] | 0.002* |
| Partner smoking (current) | 25/33 (75.8%) | 9/54 (16.7%) | <0.001* |