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Table 4 Factors associated with contacts being GeneXpert-diagnosed TB infected

From: Tuberculosis infection among youths in overcrowded university hostels in Kenya: a cross-sectional study

  CRR (95% CI) P-value ARR (95% CI)# P-value
Contact type
 Household Reference    
 Social 0.24 (0.03–2.08) 0.19   
Age in years 0.99 (0.87–1.12) 0.84 1.02 (0.87–1.19) 0.84
Gender
 Male Reference 0.61 Reference 0.66
 Female 1.60 (0.26–9.87) 1.50 (0.25–9.02)
Time spent with index case
 All time Reference    
 Night only 0.35 (0.03–3.49) 0.37   
 Day only 0.23 (0.02–2.34) 0.21   
Share a bed with index case
 No Reference 0.006 Reference 0.008
 Yes 20.0 (2.33–171.8) 22.2 (2.45–202)
Sleep in same room with index case
 No Reference 0.07   
 Yes 7.62 (0.83–68.90)   
Clinical signs
 Coughing ≥ 2 weeks    
 Fever 6.40 (0.72–57.3) 0.09 8.15 (0.86–76.8) 0.06
 Had weight loss 0.84 (0.14–5.03) 0.85   
 Drenching night sweats    
 Swelling at neck/armpits/groin 1.19 (0.13–10.7) 0.87   
Underlying medical conditions    
HIV positive    
Model performance and goodness of fit
 AUC (95% CI)    0.87 (0.72–0.98)
 Hosmer–Lemeshow test    4.59 0.80
  1. CRR crude risk ratio, ARR adjusted risk ratio, #Variables reported are those retained in the multivariable model using stepwise approach with a P < 0.05, RR and P-values are from the Log-binomial regression models, AUC area under receiver operating characteristics