Table 2.
Distribution of FEV1/FVC < 70 stratified on gender, smoking status, age, and BMI
| Risk factor | FEV1/FVC < 70 N (%) | FEV1/FVC ≥ 70 N (%) | 95% CI for OR | P-value |
|---|---|---|---|---|
| Gender | ||||
| Female | 527 (33.1) | 1063 (66.9) | ||
| Male | 551 (36.6) | 954 (63.4) | [1.01–1.38] | 0.039 |
| Smoking | 1290 (64.5) | |||
| Smoker | 713 (35.5) | |||
| Ex-smoker | 343 (34.6) | 647 (65.4) | [0.64–0.91] | 0.002 |
| Never smoker | 22 (21.5) | 80 (78.5) | [0.27–0.74] | 0.001 |
| Age (years) | ||||
| 36–48 | 144 (17.9) | 657 (82.1) | ||
| 49–58 | 262 (31.6) | 566 (68.4) | ||
| 59–66 | 312 (41.7) | 436 (58.3) | ||
| 67–90 | 360 (50.0) | 358 (50.0) | [2.20–2.84] | <0.001 |
| BMI (kg/m2) | ||||
| 14.4–23.1 | 327 (42.2) | 447 (57.8) | ||
| 23.2–25.6 | 301 (39.3) | 464 (60.7) | ||
| 25.7–28.7 | 231 (30.1) | 536 (69.9) | ||
| 28.8–55.0 | 219 (27.7) | 570 (72.3) | [0.64–0.78] | <0.001 |
Notes: The grouping of age and body mass index (BMI) is based on quartiles. The 95% confidence intervals (CI) and P-values for odds ratios (OR) were obtained from multivariate logistic regression. Female smokers were set as reference levels for the OR. The OR for age and BMI correspond to an increase in interquartile range.