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. 2019 Oct 22;19:184. doi: 10.1186/s12890-019-0939-y

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