Table 2.

Logistic regression for the relationships of race or ethnicity and education with Web-based survey participation.

Predictor			Beta	SE	Wald chi-square (df)	P value	ORa (95% CI)
Consent signed to participate
	Race or ethnicity (black as a reference group)
		NHWb	0.55	0.24	5.17 (1)	.02	1.73 (1.08-2.78)
		Hispanic	0.24	0.38	0.42 (1)	.52	1.28 (0.61-2.69)
		Asian	0.73	0.35	4.32 (1)	.04	2.07 (1.04-4.13)
Demographic data completion
	Race or ethnicity (black as a reference group)
		NHW	0.42	0.35	1.44 (1)	.23	1.52 (0.77-3.01)
		Hispanic	−0.01	0.51	0 (1)	.98	0.99 (0.36-2.69)
		Asian	−0.03	0.44	0.01 (1)	.94	0.97 (0.41-2.30)
Half of the survey completion
	Race or ethnicity (black as a reference group)
		NHW	0.69	0.44	2.44 (1)	.12	1.99 (0.84-4.69)
		Hispanic	0.58	0.72	0.64 (1)	.42	1.78 (0.44-7.26)
		Asian	0.46	0.72	0.41 (1)	.52	1.58 (0.38-6.44)
	Education (graduate school graduate as a reference group)
		High school graduate or less	−2.53	0.81	9.86 (1)	.001	0.08 (0.02-0.39)
		College education	−1.51	0.77	3.86 (1)	.05	0.22 (0.49-1.00)
Total survey completion
	Race or ethnicity (black as a reference group)
		NHW	1.18	0.39	9.02 (1)	<.001	3.26 (1.51-7.06)
		Hispanic	0.91	0.64	2.04 (1)	.15	2.48 (0.71-8.67)
		Asian	1.24	0.69	3.24 (1)	.01	3.44 (0.90-13.20)
	Education (graduate school graduate as a reference group)
		High school graduate or less	−1.87	0.58	10.55 (1)	<.001	0.15 (0.50-0.48)
		College education	−0.68	0.53	1.63 (1)	.2	0.51 (0.18-1.44)

^aOR: odds ratio. Models adjusted for age for both race or ethnicity and education of study participants.

^bNHW: non-Hispanic white.