Interaction analysis between COPD and characteristics, ETS (by others and at work), ex- and current smoking and pack-years and multivariate logistic regression on association between chronic mucus hypersecretion and gender, BMI, ETS (by others and at work), ex- and current smoking and pack-years, stratified by COPD
| Variables | Non-COPD | COPD | Interaction with COPD | ||
|---|---|---|---|---|---|
| OR (95% CI) | p Value | OR (95% CI) | p Value | p Value | |
| Gender (male) | 1.63 (1.29–2.10) | <0.001 | 1.33 (0.91–1.94) | 0.142 | 0.276 |
| BMI | 1.04 (1.01–1.06) | 0.010 | 1.00 (0.96–1.05) | 0.860 | 0.345 |
| ETS | |||||
| By others* | 1.29 (0.96–1.74) | 0.088 | 2.06 (1.33–3.19) | 0.001 | 0.475 |
| At work | 1.37 (0.91–2.06) | 0.128 | 0.99 (0.53–1.85) | 0.975 | 0.561 |
| Smoking habits | |||||
| Ex-smoking | 0.80 (0.58–1.12) | 0.191 | 0.78 (0.44–1.40) | 0.408 | 0.853 |
| Current smoking | 1.50 (1.04–2.18) | 0.032 | 0.85 (0.45–1.63) | 0.629 | 0.180 |
| Pack-years per 10 | 1.28 (1.14–1.44) | <0.001 | 1.28 (1.12–1.46) | <0.001 | 0.362 |
Pack-years per 10: the unit in the analysis is 10 pack-years so the OR is the estimate of 10 pack-years.
bold=p value <0.05.
*At least one hour per day during the last year.
BMI, Body Mass Index; COPD, chronic obstructive pulmonary disease; ETS, environmental tobacco smoke.