Table 7

Associations between patient characteristics and incidence of TB
Determinant Unadjusted hazard ratio 95% CI Adjusted hazard ratio 95% CI
Follow up TST outcome *
Negative < 10 mm Reference Reference
Positive ≥ 10 mm 61.28 7.95 - 472.38 58.08 7.23 - 435.21
Baseline TST outcome
Negative < 10 mm Reference Reference
Positive ≥ 10 mm** 1.30 0.37 - 4.63 4.70 0.56 - 39.41
Age group (years)
12-14 Reference Reference
15-16 1.58 0.39 - 6.33 1.58 0.39 - 6.33
17-18 3.49 1.02 - 11.94 2.49 0.67 - 9.28
Sex
Male Reference Reference
Female 0.27 0.08 – 0.95 0.32 0.09 - 1.17
Education level
> 7 years Reference Reference
None
≤ 7 years 0.65 0.18 - 2.32 0.9 0.20 - 4.06
TB contact during follow-up
No Reference
Yes 2.73 0.61 - 12.16
Cough during follow-up
<14 days Reference
None 0.71 0.14 - 3.54
≥14 days 0.78 0.16 - 3.75

Key: 95% CI = 95% Confidence Interval.

Note:

* One individual with TB during follow up had a positive TST of ≥10 mm at baseline;

**Those with a positive TST at baseline were not given TST again at 1 year and 2 years of follow up.

Waako et al.

Waako et al. BMC Infectious Diseases 2013 13:349   doi:10.1186/1471-2334-13-349

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