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Table 2 Individual epidemiological measures

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

  PTST- TSTC TST+ Total Statistical comparison across 3 groups Statistical comparison of PTST- vs. TSTC + TST+ Statistical comparison of PTST- + TSTC vs. TST+
Share bed with index case
No 122 (85.9%) 140 (83.3%) 698 (77.6%) 960 (79.3%)    
Yes 20 (14.1%) 28 (16.7%) 202 (22.4%) 250 (20.7%)    
All 142 168 900 1210 0.028 0.039 0.009
Share room with index case
No 65 (45.8%) 83 (49.4%) 297 (33.0%) 445 (36.8%)    
Yes 77 (54.2%) 85 (50.6%) 603 (67.0%) 765 (63.2%)    
All 142 168 900 1210 <0.0005* <0.0005* <0.0005*
Share meals with index case
No 14 (9.9%) 16 (9.5%) 65 (7.2%) 95 (7.9%)    
Yes 128 (90.1%) 152 (90.5%) 835 (92.8%) 1115 (92.1%)    
All 142 168 900 1210 0.380 0.344 0.166
Type of house (muzigo vs other)
Not Muzigo 75 (52.8%) 95 (56.9%) 397 (44.4%) 567 (47.1%)    
Muzigo 67 (47.2%) 72 (43.1%) 497 (55.6%) 636 (52.9%)    
All 142 167 894 1203 0.004 0.148 0.001*
Frequency of contact with index case
<1 day/wk 1 (0.7%) 2 (1.2%) 19 (2.1%) 22 (1.8%)    
1-3 day 6 (4.2%) 7 (4.2%) 38 (4.2%) 51 (4.2%)    
4-6 days 7 (4.9%) 5 (3.0%) 24 (2.7%) 36 (3.0%)    
daily 129 (90.1%) 153 (91.1%) 816 (90.7%) 1097 (90.7%)    
Total 142 167 897 1206 0.740 0.536 0.593
Time spent with index case (hours)
<1 3 (2.1%) 5 (3.0%) 19 (2.1%) 27 (2.3%)    
2-6 17 (12.1%) 16 (9.5%) 78 (8.8%) 111 (9.3%)    
7-12 70 (49.6%) 87 (51.8%) 511 (57.5%) 668 (55.8%)    
13-18 29 (20.6%) 38 (22.6%) 162 (18.2%) 229 (19.1%)    
>18 22 (15.6%) 22 (13.1%) 118 (13.3%) 162 (13.5%)    
Total 141 168 888 1197 0.659 0.339 0.539
Number of windows in house
Mean (SD) 2.6 (2.773) 2.64 (2.475) 1.87 (2.056)   <0.0005* < 0.0005* 0.029
Number of rooms in house
Mean (SD) 3.44 (3.183) 3.26 (2.541) 2.70 (2.383)   <0.0005* < 0.0005* 0.041
# People in household/room
Mean 7.80 (5.235) 6.76 (4.129) 6.10 (3.672)   <0.0005* < 0.0005* < 0.0005*
Number of TB cases in home
Mean 1.67 (0.98) 1.66 (0.867) 1.61 (.896)   0.985 0.363 0.799
Relationship to index case   
Spouse 6 (4.2%) 10 (6.0%) 122 (13.6%) 138 (11.4%)    
Parent 3 (2.1%) 5 (3.0%) 48 (5.3%) 56 (4.6%)    
Sibling 23 (16.2%) 22 (13.1%) 113 (12.6%) 158 (13.1%)    
Avuncular 24 (16.9) 29 (17.3%) 128 (14.2%) 181 (15.0%)    
Child 59 (41.5%) 66 (39.3%) 325 (36.1%) 450 (37.2%)    
Grandparent/Child 3 (2.1%) 4 (2.4%) 18 (2.0%) 25 (2.1%)    
Unrelated 21 (14.8%) 27 (16.1%) 126 (14.0%) 174 (14.4%)    
Other relative 3 (2.1%) 5 (3.0%) 20 (2.2%) 28 (2.3%)    
Total 142 168 900 1210 0.060 0.102 0.003
  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.