Respiratory symptoms in relation to exposure to environmental tobacco smoke (ETS)
| 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 (CI) are adjusted for age, sex, and dialect group plus ETS variables as indicated in subsequent footnotes. | |||||||||
| ‡ORs adjusted for adult home (no, 1 past, 2+ past, 1+ current smokers) and work (no, past or current) exposure. | |||||||||
| §Number of smokers for childhood and adult ETS exposure is a semi-quantitative variable representing the minimum number of smokers. | |||||||||
| ¶ORs adjusted for childhood (no, 1, 2, 3+ smokers) and work (no, past or current) exposure. | |||||||||
| **ORs adjusted for childhood (no, 1, 2, 3+ smokers) and adult home (no, 1 past, 2+ past, 1+ current smokers) exposure. | |||||||||
| Childhood home ETS exposure‡ | |||||||||
| None | 11011 | 473 | 1.00 | 36 | 1.00 | 183 | 1.00 | 36 | 1.00 |
| 1 smoker§ | 10599 | 515 | 1.06 (0.92 to 1.22) | 59 | 1.21 (0.76 to 1.92) | 246 | 1.18 (0.95 to 1.47) | 75 | 2.07 (1.32 to 3.24) |
| 2 smokers | 6649 | 362 | 1.13 (0.96 to 1.32) | 33 | 1.01 (0.59 to 1.73) | 181 | 1.33 (1.04 to 1.69) | 51 | 2.24 (1.36 to 3.70) |
| 3+ smokers | 2883 | 154 | 1.06 (0.86 to 1.31) | 21 | 1.42 (0.77 to 2.63) | 90 | 1.48 (1.10 to 1.99) | 23 | 2.36 (1.29 to 4.32) |
| ptrend | 0.317 | 0.491 | 0.004 | 0.005 | |||||
| 1+ smokers | 20131 | 1031 | 1.08 (0.94 to 1.23) | 113 | 1.18 (0.76 to 1.82) | 517 | 1.25 (1.02 to 1.53) | 149 | 2.14 (1.39 to 3.29) |
| Adult home ETS exposure¶ | |||||||||
| None | 8635 | 369 | 1.00 | 21 | 1.00 | 148 | 1.00 | 38 | 1.00 |
| 1 past smoker | 9558 | 425 | 0.98 (0.83 to 1.15) | 53 | 2.13 (1.22 to 3.72) | 243 | 1.30 (1.03 to 1.64) | 66 | 1.04 (0.66 to 1.62) |
| 2+ past smokers | 6655 | 374 | 1.22 (1.02 to 1.45) | 39 | 2.37 (1.27 to 4.43) | 165 | 1.26 (0.96 to 1.66) | 51 | 1.06 (0.63 to 1.76) |
| 1+ current smokers | 6294 | 336 | 1.16 (0.98 to 1.38) | 36 | 2.69 (1.46 to 4.94) | 144 | 1.33 (1.02 to 1.73) | 30 | 0.75 (0.44 to 1.30) |
| ptrend | 0.017 | 0.005 | 0.099 | 0.285 | |||||
| Past or current | 22507 | 1135 | 1.07 (0.93 to 1.24) | 128 | 2.30 (1.36 to 3.91) | 552 | 1.30 (1.04 to 1.62) | 147 | 0.97 (0.64 to 1.49) |
| Work ETS exposure** | |||||||||
| None | 24325 | 1099 | 1.00 | 99 | 1.00 | 465 | 1.00 | 124 | 1.00 |
| Past or current | 6817 | 405 | 1.30 (1.15 to 1.47) | 50 | 1.51 (1.05 to 2.17) | 235 | 1.55 (1.31 to 1.83) | 61 | 1.53 (1.10 to 2.11) |