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Baseline characteristics of the patient and control groups
| Variable | Statistic | Patient (n=200) | Control (n=190) | P-value |
|---|---|---|---|---|
| Age group | 0.1178 | |||
| <65 years | n (%) | 114 (57.00) | 123 (64.74) | |
| >=65 years | n (%) | 86 (43.00) | 67 (35.26) | |
| Gender | NA | |||
| Male | n (%) | 200 (100.00) | 190 (100.00) | |
| Smoking status | 0.0035 c | |||
| Missing | n (%) | 1 (0.53) | ||
| Mild | n (%) | 71 (35.50) | 94 (49.47) | |
| Moderate | n (%) | 80 (40.00) | 70 (36.84) | |
| Severe | n (%) | 49 (24.50) | 25 (13.16) | |
