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Table 1 Population demographics

From: Clinical and epidemiological characteristics of individuals resistant to M. tuberculosis infection in a longitudinal TB household contact study in Kampala, Uganda

  PTST- (N,% of PTST-) TSTC (N,% of TSTC) TST + (N,% of TST+) Total Comparison across 3 groups Comparison of PTST- vs. TSTC + TST+ Comparison of PTST- and TSTC vs. TST+
Age at baseline (years)     
2 years or less 19 (13.4%) 22 (13.1%) 103(11.4%) 144(11.9%)    
>2 and equal to 5 27(19.0%) 24(14.3%) 93(10.3%) 144(11.9%)    
>5 or less than 15 65 (45.8%) 47 (28.0%) 237 (26.3%) 349 (28.8%)    
>15 31 (21.8%) 75 (44.6%) 467 (51.9%) 573 (47.3%)    
All 142 168 900 1210 < 0.0005* <0.0005* < 0.0005*
Sex   
Female 73 (51.4%) 98 (58.3%) 488 (54.2%) 659 (54.5%)    
Male 69 (48.6%) 70 (41.7%) 412 (45.8%) 551 (45.5%)    
All 142 168 900 1210 0.456 0.437 0.775
HIV status
Negative 127 (91.4%) 157 (96.9%) 801 (92.5%) 1085 (93%)    
Positive 12 (8.6%) 5 (3.1%) 65 (7.5%) 82 (7.0%)    
All 139 162 866 1167 0.095 0.430 0.277
Presence of BCG scar
No 27 (19.0%) 32 (19.0%) 184 (20.4%) 243 (20.1%)    
Yes 93 (65.5%) 117 (69.6%) 627 (69.7%) 837 (69.2%)    
Uncertain 22 (15.5%) 19 (11.3%) 89 (9.9%) 130 (10.7%)    
All 142 168 900 1210 0.381 0.151 0.254
PPD at baseline (mm) 1
Mean (SD) 0.30 (1.153) 1.87 (3.238) 15.91 (3.605)   N/A N/A N/A
  1. PTST- = Persistently negative tuberculin skin test; TSTC = Tuberculin skin test converter; TST + = tuberculin skin test positive at baseline.
  2. *indicates P value that is significant after multiple testing correction.
  3. 1Statistical comparisons of these three groups must account for age group; see further detail in Additional file 1.