Table 3 Demographic characteristics of COPD patients in the two phases. Data are shown as N (%) of cases or mean +/- standard deviation
Phase 1 | Phase 2 | P value | |
|---|---|---|---|
COPD cases included in data analysis (n) | 2358 | 2177 | / |
Gender | 0.80 | ||
Male | 1981 (84.0%) | 1835 (84.3%) | |
Female | 377 (16.0%) | 342 (15.7%) | |
Age (years) | 75.9 ± 10.6 | 75.8 ± 10.7 | 0.82 |
< 65 years old | 368 (15.6%) | 339 (15.6%) | 0.97 |
≥65 years old | 1990 (84.4%) | 1838 (84.4%) | |
Smoker | 658 (27.9%) | 661 (30.4%) | 0.07 |
Body Mass Index (BMI, kg/m2) | 23.1 ± 4.0 | 23.4 ± 4.1 | 0.76 |
Underweight (BMI < 18.5) | 314 (13.3%) | 263 (12.1%) | 0.06 |
Normal (BMI 18.5–22.9) | 915 (38.8%) | 797 (36.6%) | |
Overweight (BMI 23.0–24.9) | 405 (17.2%) | 433 (19.9%) | |
Obesity (BMI > 25) | 724 (30.7%) | 684 (31.4%) |