Table 4 The association of QFT positivity between age, BCG status, and smoking status among study populations.

From: Tuberculosis infection in rural labor migrants in Shenzhen, China: Emerging challenge to tuberculosis control during urbanization

Variables

 

QFT positivity (n/N)

%

Adjusted OR (95%CI)

p for likelihood ratio test

Age and smoking status

16–29 years

Never-smoker

224/1938

11.56

Reference

<0.001

Ever-smoker

99.767

12.91

1.17 (0.90, 1.50)

≥30 years

Never-smoker

298/1204

24.75

Reference

Ever-smoker

169/513

32.94

1.49 (1.19, 1.87)

Age and BCG scar status #

16–29 years

Without BCG

230/1719

13.38

Reference

0.583

With BCG

93/986

9.43

0.67 (0.52, 0.86)

≥30 years

Without BCG

173/683

25.33

Reference

With BCG

294/1034

28.43

1.16 (0.93, 1.45)

Smoking and BCG scar status &

Never-smoker

Absent

281/1756

16.00

Reference

0.067

Present

241/1386

17.39

0.87 (0.71, 1.06)

Ever-smoker

Absent

122/646

18.89

Reference

Present

146/634

23.03

1.02 (0.77, 1.35)

  1. Abbreviations: BCG = Bacillus Calmette-Guerin; CI = confidence interval; OR = odds ratio; QFT = QuantiFERON-TB Gold In-Tube.
  2. Adjusted for BCG status.
  3. #Adjusted for smoking status.
  4. &Adjusted for age.