Respiratory symptoms in relation to environmental tobacco smoke (ETS) exposure during early life and adulthood
| ETS exposure | No cough, phlegm or asthma | Asthma diagnosis | Chronic bronchitis* | Chronic phlegm without cough | Chronic dry cough | ||||
|---|---|---|---|---|---|---|---|---|---|
| N | N | OR (95% CI)† | N | OR (95% CI) | N | OR (95% CI) | N | OR (95% CI) | |
| *Chronic bronchitis was defined as combined chronic cough and phlegm. | |||||||||
| †All odds ratios (OR) and 95% confidence intervals are adjusted for age, sex, and dialect. | |||||||||
| ‡Adult exposure includes home and/or work exposure. | |||||||||
| No childhood or adult exposure‡ | 5461 | 214 | 1.00 | 12 | 1.00 | 61 | 1.00 | 14 | 1.00 |
| Childhood only | 1560 | 55 | 0.89 (0.66 to 1.21) | 3 | 0.89 (0.25 to 3.14) | 30 | 1.62 (1.04 to 2.52) | 16 | 4.03 (1.96 to 8.29) |
| Adult only | 5550 | 259 | 1.19 (0.99 to 1.43) | 24 | 2.06 (1.03 to 4.12) | 122 | 2.11 (1.55 to 2.88) | 22 | 1.57 (0.80 to 3.08) |
| Both child and adult | 18571 | 976 | 1.32 (1.13 to 1.53) | 110 | 2.87 (1.58 to 5.22) | 487 | 2.38 (1.82 to 3.12) | 133 | 2.80 (1.61 to 4.87) |