Table 6 Univariate analysis of PTB and local environmental factors

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