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Table 6 Univariate predictors of incident TB

From: Burden of tuberculosis disease among adolescents in a rural cohort in Eastern Uganda

Determinant Persons Pyrs Cases Incidence (per 100,000 pyrs) P-value (chi-square test)
Total 5000 5527 13 235 -
Follow up TST outcome *      
Negative < 10 mm 2912 3323 1 30  
Positive ≥ 10 mm 582 679 11 1620 <0.001
Not done/not read** 1506 1525 1 66  
Baseline TST outcome      
Negative < 10 mm 4179 4574 12 262 <0.001
Positive ≥ 10 mm 802 890 1 112  
Prior diagnosis TB      
No 4990 5517 13 236 -
Yes 10 11 0 0  
Schooling status      
In school 4678 5193 13 250 -
Out of school 322 335 0 0  
Age group (years)      
12-14 2339 2778 4 144  
15-16 1482 1583 4 253 0.093
17-18 1179 1167 5 429  
Sex      
Male 2589 2898 10 345  
Female 2411 2630 3 114 0.028
Education level      
> 7 years 696 733 2 273  
None 40 37 0 0 0.752
≤ 7 years 4264 4757 11 231  
TB Contact during follow-up      
No 4732 5196 11 212 0.019
Yes 268 331 2 604  
Cough during follow-up      
<14 days 2250 2602 5 192  
None 2102 2307 6 260 0.917
≥14 days 500 581 2 344  
  1. Abbreviation: Key: Pyrs Person years, TST Tuberculin Skin Test.
  2. Note:
  3. * One individual with TB during follow up had a positive TST of ≥10 mm at baseline;
  4. **Those with a positive TST at baseline were not given TST again at 1 year and 2 years of follow up.