Table 1. Characteristics of individuals referred to Baltimore City Health Department TB Clinic for evaluation of suspected M. tuberculosis infection, by study period.

Characteristic		Referrals
		Pre-QFT-GIT	Post-QFT-GIT	P value
Number		607	750
Evaluated by BCHD during in-person clinic encounter		452 (75%)	567(76%)	0.631
Gender	Female	255(42%)	325(43%)	0.624
	Male	352(58%)	425(57%)
Age	Mean Age(SD)	36.1 (15.3)	36.4 (16.5)	0.77
Foreign-born		363(59%)	507(68%)	0.003
Ethnicity*	Black	260(43%)	296(39%)	0.002*
	Asian/Pacific Island	199(32%)	224(30%)
	Latino	65(11%)	122(17%)
	White	43(7%)	35(5%)
	Other/Unavailable	40(7%)	73(10%)
HIV †	Positive	11/452(2%)	19/567(3%)	0.599
	Negative	316/452(70%)	401/567(71%)
	Refused/Unknown	125/452(28%)	147/567(26%)
Referral Source:	Drug Treatment Program	134 (22%)	104(14%)	<0.001
	Refugee	194(32%)	237(32%)	0.904
	B-Waiver	25(4%)	72(10%)	<0.001
	Health Fairs	19(3%)	40(5%)	0.047
	Civil Surgeons	21(3%)	32(4%)	0.441
	HIV clinics	7(1%)	17(2%)	0.121
	Local Health Departments**	52(9%)	66(9%)	0.879
	Dept of Corrections	4(1%)	3(.5%)	0.509
	Occupational Health	14(2%)	9(1%)	0.116
	Obstetricians	20(3%)	22(3%)	0.706
	Primary Care Providers/Other	117(19%)	148(20%)	0.865

Abbreviations: SD, Standard Deviation. BCHD, Baltimore City Health Department.

^*Ethnicity data was based on referral documentation and/or initial evaluation at BCHD. P-value for global comparison of equality of proportions of ethnicities by χ² test.

^†HIV test results are available only for those that came to BCHD for evaluation. HIV status not available for those who did not complete an LTBI evaluation at BCHD.

^**Includes referrals from other local health departments in Maryland and other states, as well as employment TB testing conducted through other BCHD programs.