Table 4.

Frequency distribution of evidence of latent tuberculosis infection (LTBI) testing occurring in the 6 months prior to LTBI treatment initiation with isoniazid (n = 1072)

Broad Categorization Used in Statistical Models	N	%	95% Confidence Interval		Detailed Categorization	N	%	95% Confidence Interval
TST	441	41.1%	38.2%	41.1%	TST procedure code only, or TST code temporally first	441	41.1%	38.2%	44.1%
IGRA	219	20.4%	18.1%	23.0%	IGRA procedure code only, or IGRA code temporally first	219	20.4%	18.1%	23.0%
Other/Unknown	412	38.4%	35.6%	41.4%	IGRA & TST procedure codes present on same day	2	0.2%	0.0%	0.7%
					Other test for MTB occurred based on procedure code (no TST or IGRA code)	5	0.5%	0.2%	1.1%
					No procedure code provided information about testing, but a diagnosis code indicated that screening occurred	31	2.9%	2.0%	4.1%
					No procedure code or diagnosis code regarding testing was present, but an LTBI diagnosis code was present	261	24.4%	21.9%	27.0%
					Neither LTBI testing procedure nor diagnosis information regarding LTBI was present	113	10.5%	8.8%	12.3%