Table 4. Association between QFT positivity and BMI (kg/m²) categories by sites.

BMI categories	QFT positivity		Adjusted OR† (95% CI)
	n/N	%
Site A
<18.5 kg/m2	41/217	18.89	0.98(0.68–1.41)
18.5–24.0 kg/m2	553/2755	20.07	Reference
24.0–28.0 kg/m2	363/1609	22.56	1.10(0.95–1.29)
≥28.0 kg/m2	95/433	21.94	1.04(0.81–1.34)
Site B
<18.5 kg/m2	20/126	15.87	0.75(0.45–1.26)
18.5–24.0 kg/m2	350/1804	19.40	Reference
24.0–28.0 kg/m2	280/1384	20.23	1.00(0.83–1.20)
≥28.0 kg/m2	151/827	18.26	0.93(0.74–1.16)
Site C
<18.5 kg/m2	58/279	20.79	0.67(0.48–0.92)
18.5–24.0 kg/m2	616/2281	27.01	Reference
24.0–28.0 kg/m2	360/1236	29.13	1.20(1.01–1.41)
≥28.0 kg/m2	139/417	33.33	1.52(1.20–1.94)
Site D
<18.5 kg/m2	49/286	17.13	0.87(0.59–1.29)
18.5–24.0 kg/m2	468/2206	21.21	Reference
24.0–28.0 kg/m2	251/1121	22.39	1.00(0.82–1.20)
≥28.0 kg/m2	79/283	27.92	1.42(1.05–1.91)

Abbreviations: BMI = body mass index. CI = confidence interval. OR = odds ratio. QFT = QuantiFERON-TB Gold In-Tube. TB = tuberculosis.

^†Controlling for age, gender, smoking status, LDL level, and history of close contact with TB patients.