Table 1.
Basic characteristics of cases and controls
| Variables | Control (n = 1727) | COPD (n = 152) | PTB (n = 1601) | t/χ 2 COPD | P COPD | t/χ 2 PTB | P PTB |
|---|---|---|---|---|---|---|---|
| Age (years) | |||||||
| Mean(±SD) | 55.03(±17.70) | 75.97(±8.93) | 52.06(±17.71) | 24.92 | < 0.001a | 4.84 | < 0.001a |
| Sex [n(%)] | 11.60 | 0.001b | 0.01 | 0.941b | |||
| Male | 1272 (73.7) | 131 (86.2) | 1181 (73.8) | ||||
| Female | 455 (26.3) | 21 (13.8) | 420 (26.2) | ||||
| Smoking [n(%)] | 34.88 | < 0.001b | 88.01 | < 0.001b | |||
| Never | 1101 (63.8) | 60 (39.5) | 762 (47.6) | ||||
| Ever | 626 (36.2) | 92 (60.5) | 839 (52.4) | ||||
| Drinking [n(%)] | 0.01 | 0.932b | 8.94 | 0.003b | |||
| Never | 1267 (73.4) | 112 (73.7) | 1246 (77.8) | ||||
| Ever | 460 (26.6) | 40 (26.3) | 355 (22.2) | ||||
aStudent’s t-test; bχ2 test