Table 2.

Comparison of participant characteristics (total sample size N = 3,636)

Variables	Survey not started	Survey started	Test Statistic (p)	Effect size	Survey partially completed	Survey fully completed	Test Statistic (p)	Effect size
	(n=3,358)	(n=278)			(n=58)	(n=198)
Age in years, M(SD)	54.0 (13.0)	58.5(11.2)	$t_{342}$= −6.27 p<.001	.341	62.6 (10.9)	57.2 (11.1)	$t_{94}$= −3.28 p=.001	.491
Range	72	59			48	57
Years education, M(SD)	15.4(2.5)	16.3(2.3)	$t_{330}$= −6.26 p<.001	.371	16.2 (2.4)	16.4 (2.3)	$t_{87}$= .47 p=.640	.071
Range	14	8			8	8
Gender, n (%)			${\chi }_1^2$= .17 p= .682	.022			${\chi }_1^2$= 4.30 p=.038	.142
Male	558 (15.4%)	43 (15.5%)			3 (5.2%)	34 (17.2%)
Female	2,800 (77.0%)	235 (84.5%)			55 (94.8%)	164 (82.8%)
Ethnicity, n (%)			${\chi }_1^2$= 2.10 p=.152	.032			Fisher’s exact test p=.201	N/A
Latino	278 (7.7%)	16 (5.8%)			1 (1.7%)	13 (6.6%)
Non-Latino	2,970 (81.6%)	258 (92.8%)			57 (98.3%)	183 (92.4%)
Declined to state	4 (3.0%)	4 (1.4%)			0 (0.0%)	2 (1.0%)
Race, n (%)			${\chi }_1^2$= .02 p=.886	<.012			${\chi }_1^2$= 4.70 p=.030	.152
Black only	2,652 (72.9%)	218 (78.4%)			52 (91.2%)	149 (75.3%)
Black and other races	706 (19.4%)	60 (21.6%)			6 (10.5%)	49 (24.8%)
Self-report memory concern, n (%)	2,057 (56.6%)	142 (51.1%)	${\chi }_1^2$= 14.28 <.001	.072	38 (65.52%)	95 (47.9%)	${\chi }_1^2$= 4.85 p=.028	.152
Report family history of AD, n (%)	931 (25.6%)	100 (35.9%)	${\chi }_1^2$= 8.06 p=.005	.062	24 (41.4%)	69 (34.9%)	${\chi }_1^2$= .28 p=.469	.042

¹Note. = Cohen’s d,

²= Cramer’s V.