Table 1.
Clinical characteristics of patients in the death group and survival group
| Parameter | Both groups | Death groups | Survival groups | P-value |
|---|---|---|---|---|
| Subjects, n | 204 | 113 | 91 | |
| Sex (M/F), n | 201/3 | 110/3 | 91/0 | 0.083 |
| Age, years | 67.9±9.4 | 71.0±8.5 | 64.0±8.9 | <0.001 |
| Pack-year | 45.3±34.5 | 45.1±36.5 | 45.7±32.0 | 0.897 |
| Smoking time, years | 38.2±11.5 | 40.3±12.7 | 35.7±9.3 | 0.003 |
| Cigarettes smoked in 1 day, n | 23.0±13.0 | 22.5±14.0 | 23.6±11.6 | 0.539 |
| Age of onset of smoking, years | 25.9±8.3 | 27.0±8.8 | 25.7±7.4 | 0.059 |
| Quitting smoking | 92 | 40 | 52 | 0.001 |
| Time of quitting smoking, years | 4.4±7.0 | 3.6±6.4 | 5.3±7.7 | 0.083 |
| Age of quitting smoking, years | 58.8±10.4 | 62.8±10.8 | 55.6±8.9 | 0.001 |
| Course of disease, years | 12.7±10.8 | 13.5±12.5 | 10.7±7.9 | 0.054 |
| Onset of symptoms, years | 55.6±12.5 | 57.5±13.4 | 53.3±10.9 | 0.017 |
| Smoking time before disease, years | 29.5±11.8 | 30.8±13.0 | 28.1±10.0 | 0.088 |
| Pack-year before disease | 34.0±26.0 | 33.9±28.2 | 34.2±23.1 | 0.935 |
| FVC% predicted | 71.5±19.4 | 73.4±20.1 | 69.1±18.1 | 0.113 |
| FEV1% predicted | 43.3±19.1 | 39.6±17.8 | 46.5±19.6 | 0.010 |
| FEV1/FVC | 46.7±11.3 | 44.4±11.3 | 48.5±11.0 | 0.009 |
| RV% predicted | 207.5±66.7 | 216.7±69.2 | 200.1±63.9 | 0.077 |
| RV/TLC | 66.0±10.8 | 65.0±11.4 | 67.4±10.0 | 0.117 |
| DLCO % predicted | 72.9±45.5 | 68.0±27.3 | 76.9±55.8 | 0.163 |
| R% predicted | 256.6±133.0 | 254.6±129.4 | 259.1±138.0 | 0.806 |
| PO2, mmHg | 81.1±23.7 | 81.4±25.3 | 80.8±21.7 | 0.867 |
| PCO2, mmHg | 45.0±14.2 | 45.8±13.8 | 44.1±14.6 | 0.406 |
Notes: Statistically significant values are shown in bold. Data shown as mean ± standard deviation.
Abbreviations: DLCO, single-breath diffusing capacity of carbon monoxide; FEV1, forced expiratory volume in one second; FVC, forced vital capacity; PCO2, partial pressure of carbon dioxide; PO2, partial pressure of oxygen; R, airway resistance; RV, residual volume; TLC, total lung capacity.