Table 5.

Estimated Treatment Effect (Group vs. Self-Directed) by Format Preference, Adjusting for Baseline Covariates

		Data Collection Timepoints
	Format	4-Month			18-Month
Health Outcomes	Preference	Intervention	Effect	P-value	Intervention	Effect	P-value
Functional Status Scores
SIP physical dimension	Prefer GP	0.031		0.884	−2.104		0.420
	Prefer SD	−2.338		0.479	2.123		0.757
Difference In Treatment effect***		−2.369		0.513	−4.227		0.615
N****			657			754
SIP psychosocial dimension	Prefer GP	−4.848		0.026*	−0.347		0.876
	Prefer SD	3.928		0.384	0.253		0.936
Difference In Treatment effect		−8.776		0.116	−0.600		0.900
N			657			754
6-minute walk	Prefer GP	−8.665		0.829	18.844		0.770
	Prefer SD	21.06		0.775	−4.55		0.926
Difference In Treatment effect		−29.727		0.791	23.394		0.955
N			453			469
Cardiac symptoms
Cardiac symptom number	Prefer GP	0.213		0.332	0.579		<0.001**
	Prefer SD	0.100		0.933	−0.312		0.362
Difference In Treatment effect		0.113		0.671	0.891		0.011
N			661			760
Cardiac symptom frequency	Prefer GP	0.576		0.391	1.895		<0.001**
	Prefer SD	0.592		0.844	−1.119		0.335
Difference In Treatment effect		−0.016		0.891	3.014		0.018
N			657		755
Cardiac symptom bother	Prefer GP	0.485		0.657	2.135		<0.001**
	Prefer SD	0.702		0.746	−1.112		0.449
Difference In Treatment effect		−0.217		0.896	3.247		0.034
N			659			758

^*p≤0.05

^**p≤0.01

^***The difference in treat effect between two preference groups: treatment effect in Prefer G minus treatment effect in Prefer SD.

^****N: the number of subjects used in each analysis.