Table 2.
Frequency (%) of chronic respiratory diseases in never-smokers in relation to passive smoking and concomitant disease history
| Characteristic | Total N = 732 (100%) |
COPD N = 25 (3.4%) |
P-value | Chronic bronchitis N = 86 (11.8%) |
P-value |
|---|---|---|---|---|---|
| At least one smoker in the family | 0.600 | 0.540 | |||
| No | 448 | 4.6% | 11.5% | ||
| Yes | 284 | 5.6% | 13.1% | ||
| At least one smoker at work | 1.000 | 0.892 | |||
| No | 653 | 4.9% | 12.2% | ||
| Yes | 79 | 3.7% | 11.7% | ||
| Cardiac problem | 0.185 | 0.019 | |||
| No | 622 | 4.3% | 10.9% | ||
| Yes | 110 | 8.5% | 19.0% | ||
| Low birth weight | 0.262 | 0.002 | |||
| No | 639 | 4.4% | 10.5% | ||
| Yes | 17 | 10% | 18.8% | ||
| Unknown* | 76 | 8.1% | 24.7% | ||
| Childhood chronic lung problem | <0.001 | <0.001 | |||
| No | 670 | 4.2% | 10.6% | ||
| Yes | 19 | 57.1% | 46.7% | ||
| Unknown* | 43 | 0% | 23.3% | ||
| Pneumonia during childhood | <0.001 | 0.002 | |||
| No | 653 | 4.1% | 10.7% | ||
| Yes | 20 | 33.3% | 29.4% | ||
| Unknown* | 60 | 8.6% | 22.8% | ||
| Mother smoked during pregnancy | 0.330 | 0.743 | |||
| No | 617 | 3.2% | 11.5% | ||
| Yes | 78 | 5.0% | 10.5% | ||
| Unknown* | 38 | 5.6% | 25.0% | ||
| Father smoked during pregnancy | 0.105 | 0.987 | |||
| No | 352 | 3.8% | 12.0% | ||
| Yes | 328 | 6.3% | 11.8% | ||
| Unknown* | 51 | 3.6% | 16.0% | ||
| Mother smoked during childhood | 0.913 | 0.955 | |||
| No | 610 | 5.0% | 11.2% | ||
| Yes | 97 | 5.8% | 11.8% | ||
| Unknown* | 25 | 0 | 34.6% | ||
| Father smoked during childhood | 0.327 | 0.896 | |||
| No | 335 | 4.3% | 11.7% | ||
| Yes | 362 | 5.8% | 11.2% | ||
| Unknown* | 35 | 0 | 23.5% |
Note:
*
The “does not know” modality was not included in statistical testing.
Abbreviation: COPD, chronic obstructive pulmonary disease.