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

BMC Infectious Diseases

Table 6 Univariate predictors of incident TB

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

Abbreviation: Key: Pyrs Person years, TST Tuberculin Skin Test.
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.

ISSN: 1471-2334