22
Table 3: Risk Factors Associated with QFT and TST Positivity
†Variables
Total N
QFT-Positive n (%)
Unadjusted RR (95% CI)
Adjusted RR* (95% CI)
TST-Positive n (%)
Unadjusted RR (95% CI)
Adjusted RR* (95% CI)
Number of children 2,507 142 (5.7) 664 (26.5)
Age Group
2–5 years old 6–9 years old 10–14 years old
505 700 1,302
13 (2.6) 27 (3.9) 102 (7.8)
1.0 1.50 (0.78, 2.87) 3.04 (1.73, 5.37)
1.0 1.52 (0.79, 2.92) 3.05 (1.72, 5.38)
101 (20.0) 173 (24.7) 390 (30.0)
1.0 1.24 (1.00, 1.54) 1.50 (1.24, 1.82)
1.0 1.28 (1.04, 1.57) 1.64 (1.36, 1.97) Sex
Male Female
1,304 1,203
70 (5.4) 72 (6.0)
1.0 1.12 (0.81, 1.53)
313 (24.0) 351 (29.2)
1.0 1.22 (1.07, 1.39)
1.0 1.17 (1.04, 1.32) Country of Exam
Mexico The Philippines Vietnam
959 952 596
56 (5.8) 60 (6.3) 26 (4.4)
1.0 1.08 (0.76, 1.54) 0.75 (0.48, 1.18)
1.0 1.12 (0.77, 1.62) 0.79 (0.50, 1.25)
94 (9.8) 406 (42.7) 164 (27.5)
1.0 4.35 (3.54, 5.34) 2.81 (2.23, 3.54)
1.0 4.28 (3.47, 5.27) 2.85 (2.26, 3.60) TB results in family members
Family member with culture-confirmed TB Family member was a TB suspect All family members with normal CXR**
75 287 2,145
9 (12.0) 16 (5.6) 117 (5.5)
2.20 (1.16, 4.16) 1.02 (0.62, 1.70)
1.0
2.24 (1.18, 4.28) 0.97 (0.57, 1.63)
36 (48.0) 115 (40.1) 513 (23.9)
2.01 (1.57, 2.57) 1.68 (1.43, 1.97)
1.0
1.40 (1.12, 1.75) 1.18 (1.01, 1.37)
† 1.0
Relative risks (RR) and 95% confidence intervals (CI) are from log-binomial regression models;
*Adjusted models included age, sex, country of exam and the TB results of immigrating family members;
**CXR = Chest Radiograph
