Table 2.

Baseline characteristics of subjects who did or did not develop definite or probable TB during prospective follow-up^*

	n	TB (n = 92)	No TB (n = 887)	P value†
Age, mean, years	979	34.5	32.9	0.066
Male, %	979	29.3	23.7	0.227
CD4 count, cell/µl	977	362.7	481.6	<0.001
TST, mean, mm	961	7.7	4.9	0.001
TST ≥ 5 mm, %	961	48.9	30.8	<0.001
Antiretroviral therapy at baseline, %	979	0.0	3.7	0.060
Previous TB treatment, %	979	18.4	7.1	<0.001

^*Per protocol, at study entry all subjects were HIV-infected, had a BCG scar, a CD4 count of ≥200 cells/mm³ and had no evidence of active TB (see Methods for details).

^†Mann-Whitney U-tests.

TB = tuberculosis; TST = tuberculin skin test; HIV = human immunodeficiency virus; BCG = bacille Calmette-Guérin.