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Table 3 Risk factors for a positive tuberculin skin test (TST) for the 10 mm cut-off method and the 17 mm mirror method

From: Estimating the annual risk of infection with Mycobacterium tuberculosis among adolescents in Western Kenya in preparation for TB vaccine trials

Risk Factor Tuberculin skin test > = 10 mm n = 4808 Multivariate Tuberculin skin test > = 17 mm n = 4808 Multivariate
Negative Positive OR, 95% CI OR, 95% CI Negative Positive OR, 95% CI OR, 95% CI
Sex Female 1650 677/2327 (29.1%) 1   2076 251/2327 (10.8%) 1  
Male 1614 867/2481 (34.9%) 1.3 (1.2,1.5) 1.3 (1.2,1.5) 2129 352/2481 (14.2%) 1.4 (1.2,1.6) 1.4 (1.2,1.7)
History of a house hold TB contact Yes 224 150/374 (40.1%) 1.5 (1.2,1.8) 1.5(1.2,1.8) 119 19/138 (13.8%) 1  
No 3040 1394/4434 (31.4%) 1   4086 584/4670 (12.5%) 1.6 (1.2,2.1) 1.6(1.2,2.1)
Previous TB Yes 15 6/21 (28.6%) 1   18 3/21 (14.3%) 1  
No 3232 1528/4787 (32.1%) 0.8 (0.3,2.1)   4163 597/4760 (12.5%) 1.2 (0.4,3.7)  
BCG Scar Yes 2623 1324/3947 (33.5%) 1.3 (1.2,1.7) 1.5 (1.3,1.8) 3450 497/3947 (12.6%) 1.0 (0.8,1.3) 1.0 (0.8,1.3)
No 641 220/861 (25.6%) 1   753 106/859 (12.3%) 1  
Residence Urban 189 69/258 (26.7%) 1   231 27/258 (10.5%) 1  
Rural 3075 1475/4550 (32.4%) 1.2 (1.0,1.5) 1.4 (1.1,1.9) 3974 576/4550 (12.7%) 1.2 (0.8,1.9) 1.2(0.8,1.9)
School going Yes 3103 1415/4518 (31.3%) 1   3960 558/4518 (12.4%) 1  
No 161 129/290 (44.5%) 1.8(1.4,2.2) 1.8 (1.4,2.3) 245 45/290 (15.5%) 1.3 (0.9,1.8) 1.3(1.0,1.8)
Orphaned Yes 1136 585/1721 (34.0%) 1   1474 247/1721 (14.4%) 1  
No 2128 959/3087 (31.1%) 1.1 (1.0,1.3) 1.1(1.0,1.3) 2731 356/3087 (11.5%) 1.3 (1.1,1.5) 1.3(1.1,1.5)