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Table 3 Predictors of (a) positive QuantiFERON®TB Gold results (b) tuberculin skin test reaction >15 mm

From: Screening for tuberculosis infection among newly arrived asylum seekers: Comparison of QuantiFERON®TB Gold with tuberculin skin test

A. Predictors of positive QFT    Univariate Multivariate
Variable Characteristic Total No. No. QFT+ OR (95%CI) p-value a OR (95%CI) p-value
BCG – scar no scar 246 68 1 0.53   
  scar 658 196 1.1 (0.8–1.5)    
Sex male 685 202 1 0.53   
  female 227 62 0.9 (0.6–1.3)    
Age group 18–29 years 471 129 1 < 0.001 1 < 0.001
  30–39 years 291 75 0.9 (0.7–1.3)   1.1 (0.8–1.5)  
  40–49 years 115 40 1.4 (0.9–2.2)   1.8 (1.1–2.9)  
  50+ years 35 20 3.5 (1.8–7.1)   4.6 (2.2–9.5)  
Origin Asia 418 82 1 < 0.001 1 < 0.001
  Europe 115 22 1.0 (0.6–1.6)   1.0 (0.6–1.7)  
  Africa 371 159 3.1 (2.2–4.2)   3.3 (2.4–4.6)  
Exposure no 898 255 1 0.01 1 0.02
  yes 14 9 4.5 (1.5–13.7)   4.0 (1.3 – 12.9)  
Previous diagnosis of tuberculosis no 904 259 1 0.05   
  yes 8 5 4.2 (1 – 17.5)    
Log likelihood = -502.86642, p-value final model = 0.000, No. of observations in final model = 904
B. Predictors of TST ≥ 15 mm    Univariate Multivariate
Variable Characteristic Total No. No. TST ≥15 mm OR (95%CI) p-value a OR (95%CI) p-value
BCG – scar no scar 246 39 1 0.85   
  scar 658 101 1.0 (0.6–1.4)    
Sex male 685 85 1 < 0.001 1 < 0.001
  female 227 56 2.3 (1.6–3.4)   1.9 (1.3–2.8)  
Age group 18–29 years 471 63 1 0.31 1 < 0.002
  30–39 years 291 44 1.2 (0.8–1.7)   1.5 (1–2.3)  
  40–49 years 115 23 1.6 (1–2.7)   1.9 (1.1–3.3)  
  50+ years 35 11 3.0 (1.4–6.4)   4.3 (1.9–9.5)  
Origin Asia 418 32 1 < 0.001 1 < 0.001
  Europe 115 21 2.7 (1.5–4.9)   2.4 (1.3–4.5)  
  Africa 371 88 3.8 (2.4–5.8)   3.8 (2.4–6)  
Exposure no 898 136 1 0.05   
  yes 14 5 3.1 (1–9.4)    
Previous diagnosis of tuberculosis no 904 138 1 0.10   
  yes 8 3 3.3 (0.8–14.1)    
Log likelihood = -359.05381, p-value final model = 0.000. No. of observations in final model = 904
  1. Results from uni- and multivariate regression analyses with positive QuantiFERON®TB Gold (table 3a) and tuberculin skin test reaction >15 mm (table 3b) as outcome variables among 912 newly arrived asylum seekers to Norway, Sept. 19. 2005 – June 12. 2006. Blanks in multivariate analyses means that the variable was not a significant predictor of a positive test. Participants with American or unknown origin were excluded from statistical analysis, due to low number of cases.