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Table 1 Baseline characteristics stratified by TST results

From: A retrospective review of the two-step tuberculin skin test in dialysis patients

Characteristic Positive TST, 5 mm Negative TST, 5 mm P value Positive TST, 10 mm Negative TST, 10 mm P value
n = 62 n = 421 n = 45 n = 438
Age (years) 61.2 ± 14.4 62.5 ± 16.6 0.57 63.7 ± 13.6 62.2 ± 16.6 0.57
Race    <0.01    <0.01
 White 28.6 % 64.1 %   28.6 % 62.8 %  
 Non-white 71.4 % 35.9 %   71.4 % 37.2 %  
BCG    0.1    0.15
 Vaccinated 33.9 % 25.4 %   35.6 % 25.6 %  
 Not vaccinated 33.9 % 48.5 %   33.3 % 48.0 %  
 Unknown 32.3 % 26.1 %   31.1 % 26.5 %  
Chest radiograph    0.82    0.57
 Suggestive of TB 22.6 % 20.7 %   26.7 % 20.3 %  
 Not suggestive of TB 72.6 % 75.8 %   68.9 % 76.0 %  
 Not performed 4.8 % 3.6 %   4.4 % 3.7 %  
Dialysis Center (HD only)    0.18    0.11
 HSC 58.0 % 43.9 %   44.0 % 61.5 %  
 SOGH 18.0 % 25.2 %   25.2 % 15.4 %  
 SBGH 24.0 % 30.9 %   30.8 % 23.0 %  
Peritoneal dialysis 19.4 % 21.1 % 0.75 13.3 % 21.7 % 0.19
Clinical diagnosis of LTBI (TB Registry) 16.1 % 1.2 % <0.01 20.0 % 1.4 % <0.01
  1. Age presented as mean ± standard deviation, categorical variables presented as percentages
  2. TST tuberculin skin test, BCG Bacillus Calmette-Guérin, TB tuberculosis, HSC Health Sciences Centre, SOGH Seven Oaks General Hospital, SBGH Saint Boniface General Hospital, LTBI latent tuberculosis infection