Table 2.

Demographic characteristics by site of enrollment

	Characteristic	Total (n=500)	Rockefeller University (n=365)	Clinical Directors Network Community Health Centers (n=135)	p*
Mean age in years (range)		43 (19–86)	42 (19–86)	47 (19–78)	<0.01**
Sex	Male	183 (37%)	154 (42%)	29 (22%)	<0.01†
	Female	317 (63%)	211 (58%)	106 (79%)
Race	Caucasian	213 (43%)	188 (52%)	25 (19%)	<0.01‡
	African-American	187 (37%)	109 (30%)	78 (58%)
	Asian	40 (8%)	33 (9%)	7 (5%)
	Native Hawaiian/Pacific Islander	1 (<1%)	1 (<1%)	0 (0%)
	More than one race	19 (4%)	18 (5%)	1 (1%)
	Prefer not to answer	40 (8%)	16 (4%)	24 (18%)
Ethnicity	Hispanic	96 (19%)	50 (14%)	46 (34%)	<0.01‡
	Not Hispanic	398 (80%)	310 (85%)	88 (65%)
	Prefer not to answer	6 (1%)	5 (1%)	1 (1%)
Frequency of aspirin use	Once a week or more often	49 (10%)	29 (8%)	20 (15%)	<0.01‡
	Less than once a week	247 (49%)	219 (60%)	28 (21%)
	Never used aspirin	197 (39%)	115 (32%)	82 (61%)
	Don’t remember	7 (1%)	2 (0.5%)	5 (4%)

^*For Rockefeller University versus Community Health Centers

^**Fisher’s exact test

^†T-test

^‡Chi-square