Table A2.

Missing Data Model (DV 1=Missing, 0=Not Missing)

	Coef. Std.	Err.
Intercept	−10.66***	1.03
Experimental treatment (Ref. cat.: Text box)
Drop box	0.52	0.33
JavaScript lookup	−0.13	0.36
Number of drugs taken	−0.54***	0.09
Drug number	0.79***	0.05
Gender (1=male)	0.24	0.29
African American (1=yes)	0.86*	0.39
Hispanic (1=yes)	0.14	0.57
Education (Ref. cat.: College graduate)
<High school	0.48	0.82
High school or GED	0.29	0.45
Some college	0.19	0.47
Age category (Ref. cat.: ≤ 59)
60-69	0.11	0.36
70-79	−0.004	0.40
80+	0.22	0.53
Hours on Internet per week (Ref. cat.: 15+ hours)
<1 hour	−0.16	0.58
1-7 hours	−0.31	0.62
8-14 hours	−0.44	0.61
Self-rated memory (Ref. cat.: Fair/poor)
Excellent	0.82	0.79
Very good	0.13	0.59
Good	0.095	0.49
Self-rated speed of thinking (Ref. cat.: Fair/poor)
Excellent	0.17	0.80
Very good	−0.044	0.63
Good	0.16	0.53
Confid. filling out med. forms (Ref. cat.: Extremely)
Quite	0.20	0.35
Somewhat	0.53	0.44
Little/not at all	1.11*	0.48
Need help taking meds (1=yes)	0.20	0.52
Device type (Ref. cat.: PC)
Tablet/smartphone	5.09	33.14
Browser (Ref. cat.: Chrome)
Firefox	−0.24	0.55
MSIE	−0.16	0.41
Safari	0.047	0.65
Other	−4.54	33.13

^*p < 0.05

^**p < 0.01

^***p < 0.001