Table 2.

Predictors of knowledge of clinical trial using logistic regression, reduced model

	OR	95% CI	p-value
Race/ethnicity
Non-Hispanic White	Ref	Ref	Ref
Non-Hispanic Black	0.98	(0.62–1.51)	0.916
Hispanic	0.82	(0.48–1.37)	0.433
Other	0.68	(0.42–1.10)	0.116
Education
Less than high school	Ref	Ref	Ref
High school graduate	1.48	(0.79–2.76)	0.212
Some college	2.14	(1.13–4.02)	0.019
College or higher	4.17	(2.08–8.32)	0.0001
Family income
>$20,000	Ref	Ref	Ref
$20,000–$34,999	1.11	(0.71–1.73)	0.637
$35,000–$49,999	0.78	(0.42–1.42)	0.413
$50,000–$74,999	1.01	(0.61–1.63)	0.985
≥$75,000	0.76	(0.49–1.17)	0.214
Employment
Employed	Ref	Ref	Ref
Not employed	0.93	(0.65–1.32)	0.691
Health insurance
Yes	Ref	Ref	Ref
No	0.55	(0.30–0.98)	0.045
General health
Excellent	Ref	Ref	Ref
Very good	0.98	(0.59–1.59)	0.928
Good	0.90	(0.54–1.47)	0.662
Fair	0.80	(0.45–1.43)	0.453
Poor	0.64	(0.24–1.69)	0.364
Patient portal use
No	Ref	Ref	Ref
Yes	1.55	(1.10–2.16)	0.013
Online health information-seeking behaviour
No	Ref	Ref	Ref
Yes	1.62	(1.20–2.17)	0.002

Analysis included variables that had p<0.10 in the univariate analysis. CI = confidence interval; OR = odds ratio; Ref = reference parameter.