Table 6 Stratified analysis of factors associated with BALF positivity in pulmonary TB sputum-negative suspects and those without sputum

IGRA/Age

<0.001

 IGRA (−)/> 35 year

30/239 (12.6)

209/239 (87.4)

Reference

 IGRA (−)/≤ 35 year

34/192 (17.7)

158/192 (82.3)

1.499 (0.880–2.554)

 IGRA (+)/> 35 year

55/212 (25.9)

157/212 (74.1)

2.441 (1.494–3.986)

 IGRA(+)/≤ 35 year

146/295 (49.5)

149/295 (50.5)

6.826 (4.372–10.658)

Cavity/Age

<0.001

 Cavity (−)/> 35 year

76/453 (17.0)

371/477 (83.0)

Reference

 Cavity (−)/≤ 35 year

152/477 (31.9)

325/477 (68.1)

2.283 (1.669–3.122)

 Cavity (+)/> 35 year

16/49 (32.7)

33/49 (67.3)

2.367 (1.240–4.516)

 Cavity (+)/≤ 35 year

41/55 (74.5)

14/55 (25.5)

14.296 (7.426–27.521)

CD8/Age

<0.001

 CD8> 500/> 35 year

16/82 (19.5)

66/82 (80.5)

Reference

 CD8> 500/≤ 35 year

30/117 (25.6)

87/117 (74.4)

1.422 (0.716–2.824)

 CD8 ≤ 500/> 35 year

49/222 (22.1)

173/222 (77.9)

1.168 (0.621–2.197)

 CD8 ≤ 500/ ≤ 35 year

104/246 (42.3)

142/246 (57.7)

3.021 (1.655–5.515)

IGRA/Cavity/Age

<0.001

 IGRA (−)/Cavity (−)/> 35 year

24/219 (11.0)

195/219 (89.0)

Reference

 IGRA (−)/Cavity (−)/≤ 35 year

23/174 (13.2)

151/174 (86.8)

1.238 (0.672–2.278)

 IGRA (−)/Cavity (+)/> 35 year

6/20 (30.0)

14/20 (70.0)

3.482 (1.223–9.912)

 IGRA (−)/Cavity (+)/≤ 35 year

11/18 (61.1)

7/18 (38.9)

12.768 (4.521–36.056)

 IGRA (+)/Cavity (−)/> 35 year

45/184 (24.5)

139/184 (75.5)

2.630 (1.531–4.519)

 IGRA (+)/Cavity (−)/≤ 35 year

118/262 (45.0)

144/262 (55.0)

6.658 (4.083–10.856)

 IGRA (+)/Cavity (+)/> 35 year

10/28 (35.7)

18/28 (64.3)

4.514 (1.869–10.901)

 IGRA (+)/Cavity (+)/≤ 35 year

28/33 (84.8)

5/33 (15.2)

45.500 (16.054–128.955)