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Table 1 Description of the study population and QFT-Plus results by putative risk factors

From: Prevalence of latent tuberculosis infection among foreign students in Lübeck, Germany tested with QuantiFERON-TB Gold In-Tube and QuantiFERON-TB Gold Plus

Variable N (Col-%) QFT-Plus positive QFT-Plus negative P-Value
N (Row-%) N (Row-%)
Gender     0.345
 Female 72 (53.7) 4 (5.6) 68 (94.4)  
 Male 62 (46.3) 7 (11.3) 55 (88.7)  
Age     0.050
 19–25 years 87 (64.9) 4 (4.6) 83 (95.4)  
 26–39 years 47 (35.1) 7 (14.9) 40 (85.1)  
Country of birth classified by TB-Incidence     0.002
  < 125:100,000 86 (64.2) 2 (2.3) 84 (97.7)  
  ≥ 125:100,000 48 (35.8) 9 (18.8) 39 (81.3)  
Nationality classified by WHO regions     <0.001
 Africa 15 (11.2) 4 (26.7) 11 (73.3)  
 The Americas 16 (11.9) 0 (0) 16 (100)  
 South-East Asia 20 (14.9) 3 (15.0) 17 (85.0)  
 Europe 49 (36.6) 0 (0) 49 (100)  
 Eastern Mediterranean 20 (14.9) 0 (0) 20 (100)  
 Western Pacific 14 (10.4) 4 (28.6) 10 (71.4)  
Time living in Germany     0.808
  < 2 years 53 (39.6) 4 (7.5) 49 (92.5)  
 2–10 years 71 (53.0) 7 (9.9) 64 (90.1)  
  > 10 years 10 (7.5) 0 (0) 10 (100)  
Previous TB contact     0.007
 Yes 35 (26.1) 7 (20.0) 28 (80.0)  
 No 99 (73.9) 4 (4.0) 95 (96.0)  
Type of TB contact     0.009
 Relatives 9 (25.7) 5 (55.6) 4 (44.4)  
 Friends/acquaintances 7 (20.0) 1 (14.3) 6 (85.7)  
 Professional 14 (40.0) 0 (0) 14 (100)  
 Other type 5 (14.3) 1 (20.0) 4 (80.0)  
TB in own history     0.082
 Yes 1 (0.7) 1 (100) 0 (0)  
 No 133 (99.3) 10 (7.5) 123 (92.5)  
BCG vaccination     0.064*
 Yes 66 (49.3) 2 (3.0) 64 (97.0)  
 No 18 (13.4) 3 (16.7) 15 (83.3)  
 Unknown 50 (37.3) 6 (12.0) 44 (88.0)  
Previous TST     0.306
 Positive 11 (8.2) 2 (18.2) 9 (81.8)  
 Negative 18 (13.4) 0 (0) 18 (100)  
 Unknown 6 (4.5) 0 (0) 6 (100)  
 No TST 99 (73.9) 9 (9.1) 90 (90.9)  
Study subject     0.350
 Medicine 47 (35.1) 5 (10.6) 42 (89.4)  
 Engineering 49 (36.6) 3 (6.1) 46 (93.9)  
 Natural sciences 21 (15.7) 3 (14.3) 18 (85.7)  
 Other subject 17 (12.7) 0 (0) 17 (100)  
  1. *For BCG vaccination variable, P-Value was calculated between participants whose BCG status was known