Geometric means and their 95% confidence intervals for measures of secondhand smoke exposure in different exposure groups
| Secondhand smoke exposure | No exposure | Indirect exposure | Direct exposure | |
|---|---|---|---|---|
| All | No indoor smoking | |||
| *Percentage of samples with cotinine levels above the level of detection. | ||||
| †Sample sizes for no exposure (NEG), all indirect exposure (IEG), and direct exposure (DEG) households | ||||
| Mother reported infant exposure | ||||
| Sample size | 17 | 17 | 13 | 15 |
| Average cigs/day (interview 10 days) | 0 | 0.03 (0 to 0.11) | 0 | 5.57 (3.55 to 8.49) |
| Average cigs/day (diary 7 days) | 0 | 0.06 (0 to 0.19) | 0 | 5.75 (3.44 to 9.27) |
| Infant urine cotinine (ng/ml) | ||||
| Day 1 (n† = 15, 17, 14) | 0.30 (0.18 to 0.44) | 2.09 (1.21 to 3.31) | 2.18 (1.21 to 3.58) | 13.13 (8.09 to 20.97) |
| Day 4 (n = 14, 16, 14) | 0.41 (0.21 to 0.65) | 2.38 (1.50 to 3.57) | 2.15 (1.21 to 3.49) | 17.03 (9.65 to 28.73) |
| Day 7 (n = 11, 12, 14) | 0.32 (0.19 to 0.47) | 2.88 (1.22 to 5.79) | 2.96 (0.69 to 8.24) | 13.02 (8.01 to 20.81) |
| Maximum (n = 16, 17, 16) | 0.43 (0.25 to 0.63) | 3.49 (2.05 to 5.61) | 3.14 (1.59 to 5.60) | 20.43 (12.65 to 32.65) |
| Average (n = 16, 17, 16) | 0.33 (0.20 to 0.46) | 2.47 (1.52 to 3.78) | 2.32 (1.22 to 3.97) | 15.47 (10.10 to 23.44) |
| % above LOD* | 98 | 100 | 100 | 100 |
| Infant hair nicotine (ng/mg) | ||||
| Day 7 (n = 14, 10, 13) | 0.53 (0.25 to 0.86) | 2.65 (1.10 to 5.34) | 2.75 (0.82 to 6.75) | 5.95 (3.25 to 10.37) |
| % above LOD | 93 | 100 | 100 | 100 |
| Infant hair cotinine (ng/mg) | ||||
| Day 7 (n = 14, 10, 13) | 0.08 (0.05 to 0.11) | 0.52 (0.20 to 0.92) | 0.49 (0.10 to 1.03) | 1.05 (0.55 to 1.72) |
| % above LOD | 93 | 100 | 100 | 100 |