Table 3 Potential independent factors associated with QFT positivity of the study population.

From: Association of Body Mass Index with the Tuberculosis Infection: a Population-based Study among 17796 Adults in Rural China

Variables

n/N(%)

p for χ2 test

Adjusted OR* (95% CI)

Study site

 

<0.0001

 

 Site A

1052/5014(20.98)

 

Reference

 Site B

801/4141(19.34)

 

1.05(0.94–1.17)

 Site C

1173/4213(27.84)

 

1.39(1.26–1.54)

 Site D

847/3896(21.74)

 

1.31(1.17–1.46)

Gender

 

<0.0001

 

 Female

1793/9415(19.04)

 

Reference

 Male

2080/7849(26.50)

 

1.30(1.17–1.44)

Age (years)

 

<0.0001

 

 18–29

194/2344(8.28)

 

Reference

 30–39

313/2116(14.79)

 

1.84(1.51–2.25)

 40–49

876/4513(19.41)

 

2.50(2.10–2.97)

 50–59

934/3479(26.85)

 

3.85(3.24–4.59)

 60–69

966/3047(31.70)

 

4.93(4.14–5.86)

 ≥70

590/1765(33.43)

 

5.60(4.65–6.74)

Smoking status

 

<0.0001

 

 Never smoked

2405/12176(19.75)

 

Reference

 Ever smoked

1468/5086(28.86)

 

1.28(1.15–1.43)

History of close contact with TB patients

 

<0.0001

 

 No

3480/15826(21.99)

 

Reference

 Yes

221/708(31.21)

 

1.38(1.16–1.65)

LDL level a

 

<0.0001

 

 Normal

3117/14538(21.44)

 

Reference

 Higher than normal

754/2721(27.71)

 

1.14(1.02–1.27)

BMI (kg/m2)

 

0.0028

 

 <18.5

168/908(18.50)

 

0.89(0.76–1.03)

 18.5–24.0

1987/9046(21.97)

 

Reference

 24.0–28.0

1254/5350(23.44)

 

1.09(0.99–1.18)

 ≥28.0

464/1960(23.67)

 

1.17(1.04–1.33)

  1. Abbreviations: BMI = body mass index. CI = confidence interval. LDL = low density lipoprotein. OR = odds ratio. QFT = QuantiFERON-TB Gold In-Tube. TB = tuberculosis.
  2. *Controlling for study site, age, gender, smoking status, LDL level, history of close contact with TB, and BMI when appropriated.
  3. 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.
Back to article page