Table 1.

Characteristics of Patients by Participation Status

Variables	Response categories	Total N=2223	Participants N=369	Non-Participants N=193	p-value
Age [n, (%)]					<0.01
	50 to 59 years	1169 (53)	364 (65)	805 (48)
	60 to 79 years	1054 (47)	198 (35)	856 (52)
Race [n, (%)]					0.08
	White	955 (43)	257 (46)	698 (42)
	Nonwhite*	835 (38)	213 (38)	622 (37)
	Unknown	433 (19)	92 (16)	341 (21)
Gender [n, (%)]					0.73
	Male	914 (41)	235 (42)	679 (41)
	Female	1309 (59)	327 (58)	982 (59)

^*Total Nonwhite participants: 689 African Americans, 116 Asians, 5 Native Americans, and 25 Other.