Table 4. Multivariate Model-Predicted Differences in Shared Decision Making Among Selected Patient Subgroups Relative to a Reference Group

Characteristics	Only Main Effects		Main Effects Plus Interaction
Characteristics	Difference	P Value^*	Difference	P Value^*
Sex
Female	Ref		Ref
Male	−2.2	.29	N/A
Age (years)
18–34	4.2	.08	4.1	.08
35–49	Ref		Ref
50–64	−7.6	.001	−7.8	<.001
≥65	−16.0	<.001	−15.9	<.001
Ethnicity/race
Non-Hispanic white	Ref		Ref
Hispanic, any race	−5.0	.31	N/A
Non-Hispanic, nonwhite	4.2	.21	N/A
Treated for this depression
0–5 weeks	Ref		Ref
≥6 weeks	−11.0	<.001	−11.2	<.001
Any other depression treatment in past 6 months
No	Ref		Ref
Yes	14.0	<.0001	14.0	<.001
General health
Excellent/very good/good	Ref		Ref
Fair/poor	−7.5	<.001	N/A
Household income
Below 2× poverty threshold	−4.2	.04	−3.9	.06
Above 2× threshold	Ref		Ref
General health by sex
Female
Excellent/very good/good			Ref
Fair/poor			−4.7	.05
Male
Excellent/very good/good			0.8	.74
Fair/poor			−10.0	<.03