Table 5. The association of BMI with QFT positivity stratified by various independent factors.
| Variables | BMI | n/N(%) | Adjusted OR* (95% CI) |
|---|---|---|---|
| Gender | |||
| Female | <28.0 kg/m2 | 1540/8643(17.82) | Reference |
| ≥28.0 kg/m2 | 253/1149(22.02) | 1.26(1.08, 1.48) | |
| Male | <28.0 kg/m2 | 1869/7142(26.17) | Reference |
| ≥28.0 kg/m2 | 211/861(24.51) | 0.97(0.82, 1.15) | |
| Age (years) | |||
| <60 | <28.0 kg/m2 | 2023/11308(17.89) | Reference |
| ≥28.0 kg/m2 | 294/1529(19.23) | 1.03(0.90, 1.19) | |
| ≥60 | <28.0 kg/m2 | 1386/4477(30.96) | Reference |
| ≥28.0 kg/m2 | 170/481(35.34) | 1.31(1.07, 1.60) | |
| Smoking status | |||
| Never smoked | <28.0 kg/m2 | 2088/11140(18.74) | Reference |
| ≥28.0 kg/m2 | 317/1464(21.65) | 1.18(1.03, 1.35) | |
| Ever smoked | <28.0 kg/m2 | 1321/4643(28.45) | Reference |
| ≥28.0 kg/m2 | 147/546(26.92) | 0.99(0.80, 1.22) | |
| History of close contact with TB patients | |||
| No | <28.0 kg/m2 | 3058/14414(21.22) | Reference |
| ≥28.0 kg/m2 | 422/1878(22.47) | 1.11(0.99, 1.25) | |
| Yes | <28.0 kg/m2 | 197/666(29.58) | Reference |
| ≥28.0 kg/m2 | 24/75(32.00) | 1.17(0.696, 1.98) | |
| LDL levela | |||
| Normal | <28.0 kg/m2 | 2778/13396(20.74) | Reference |
| ≥28.0 kg/m2 | 339/1545(21.94) | 1.11(0.97, 1.27) | |
| Higher than normal | <28.0 kg/m2 | 631/2387(26.43) | Reference |
| ≥28.0 kg/m2 | 123/462(26.62) | 1.12(0.88, 1.41) | |
Abbreviations: BMI = body mass index. CI = confidence interval. LDL = low density lipoprotein. OR = odds ratio. QFT = QuantiFERON-TB Gold In-Tube. TB = tuberculosis.
*Controlling for study site, age, gender, smoking status, LDL level, and history of close contact with TB.
aRange of normal value in different study sites: Site A = 0–4.11 mmol/L, Site B = 0–3.36 mmol/L, Site C = 0–3.12 mmol/L, Site D = <3.1 mmol/L.