Table 3.
Results from logistic regression modeling for an FEV1/FVC less than 70% for the 2009–2010 National Health and Nutrition Examination Survey cohort (n = 2,956)
| Variable | OR (95% CI) | P Value |
|---|---|---|
| Joint-years | ||
| >20 | 2.1 (1.1–3.9) | 0.02 |
| 5–20 | 1.2 (0.8–1.8) | 0.4 |
| 1–5 | 1.1 (0.7–1.6) | 0.8 |
| 0 | Reference | NA |
| Tobacco pack-years | ||
| >20 | 2.9 (1.9–4.3) | <0.0001 |
| 5–20 | 1.8 (1.3–2.7) | 0.001 |
| 1–5 | 1.9 (1.1–3.4) | 0.02 |
| 0 | Reference | NA |
| Female | 0.7 (0.5–1.0) | 0.07 |
| Increasing age, yr | 1.1 (1.0–1.1) | <0.0001 |
| White race | 1.5 (1.0–2.3) | 0.04 |
| History of asthma | 3.6 (2.5–5.3) | <0.0001 |
| History of chronic bronchitis | 0.5 (0.2–1.2) | 0.1 |
| History of emphysema | 2.9 (0.7–11.3) | 0.1 |
Definition of abbreviations: CI = confidence interval; NA = not applicable; OR = odds ratio.