Table 1.

Case demographics and comparison of cases in donation database and those enrolled in the HIV risk factor study by center.

Characteristic	Cases in Donation Database		Cases Enrolled in HIV Risk Factor Study from São Paulo, Recife, and Belo Horizonte		Likelihood Ratio Chi-Square p-value	Rio de Janeiro Cases Enrolled in HIV Risk Factor Study		Likelihood Ratio Chi-Square p-value
	n	%	N	%		n	%
Total	720	100%	233	100%		108	100%
Blood Donation Center
Recife	322	45%	110	47%	0.54
Belo Horizonte	147	20%	51	22%
São Paulo	251	35%	72	31%
Donor Status
First Time	400	56%	117	51%	0.24	63	58%	0.21
Repeat	320	44%	112	49%		45	42%
Donation Type
Community	435	60%	125	57%	0.62	83	77%	<0.0001
Replacement	263	37%	88	40%		18	17%
Other/Missing	22	3%	6	3%		7	7%
Gender
Male	606	84%	196	84%	0.99	86	80%	0.31
Female	114	16%	37	16%		22	20%
Age
18–25	190	26%	67	29%	0.90	31	29%	0.41
26–30	169	24%	53	23%		24	22%
31–39	220	31%	67	29%		24	22%
40+	140	20%	46	20%		29	27%
Education
< High School	180	34%	82	33%	0.61	41	38%	0.60
≥High School	358	67%	150	65%		66	62%

NOTE: Totals may not sum to 720, 233 and 108 due to missing data for individual items.