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Table 6 Univariate analysis of PTB and local environmental factors

From: Space-time clustering and associated risk factors of pulmonary tuberculosis in southwest China

Variable Group Outside the cluster Within the cluster χ 2 P-value OR (95% CI)
No. % No. %
Place of residence Urban 46 6.6 92 11.3 9.727 0.002 1.800 (1.244–2.605)
Rural 649 93.4 721 88.7    
Family size < 3 72 10.4 60 7.4 2.431 0.119 0.676 (0.414–1.106)
3–4 281 40.4 306 37.6 0.389 0.533 0.884 (0.600–1.303)
5–6 286 41.2 378 46.5 0.128 0.721 1.073 (0.730–1.576)
> 7 56 8.1 69 8.5    
Number of persons per room ≤ 1 238 34.4 255 32 0.907 0.341 0.886 (0.690–1.137)
1.6–2 230 33.2 271 34 0.043 0.835 0.974 (0.759–1.250)
> 2 224 32.4 271 34    
Living space per person (m2) ≤ 10 30 4.4 62 7.9 7.199 0.007 2.606 (1.294–5.246)
11–25 371 54.6 459 58.5 2.387 0.122 1.560 (0.887–2.742)
26–50 250 36.8 241 30.7 0.442 0.506 1.215 (0.684–2.160)
> 50 29 4.3 23 2.9    
Number of windows per m2 of family space Low 187 31.6 244 37.3 0.694 0.405 1.158 (0.820–1.637)
Medium 318 53.7 313 47.8 0.649 0.420 0.874 (0.629–1.213)
High 87 14.7 98 15    
Frequently keeping windows open No 175 25.2 203 25 0.009 0.925 0.989 (0.783–1.249)
Yes 520 74.8 610 75    
Coal used for cooking/heating Yes 171 24.6 651 80.1 407.611 0.000 12.314 (9.650–15.713)
No 524 75.4 162 19.9    
Electricity used for cooking/heating Yes 394 56.7 125 15.4 254.639 0.000 0.139 (0.109–0.177)
No 301 43.3 688 84.6    
Firewood used for cooking/heating Yes 225 32.4 287 35.3 1.431 0.232 0.877 (0.708–1.087)
No 470 67.6 526 64.7    
Natural- or biogas used for cooking/heating Yes 14 2 56 6.9 17.808 0.000 3.598 (1.985–6.522)
No 681 98 757 93.1    
Other energy source for cooking/heating Yes 0 0 5 0.6 0.000 0.999 0.000 (0.000–0.000)
No 695 100 808 99.4    
PTB patient(s) living nearby Yes 74 17.6 85 19 0.266 0.606 1.095 (0.776–1.545)
No 346 82.4 363 81    
Contact with PTB patient(s) Yes 70 17.9 100 15.2 1.312 0.252 0.822 (0.588–1.149)
No 320 82.1 556 84.8    
  1. PTB Pulmonary tuberculosis