. Author manuscript; available in PMC: 2009 Sep 1.

Published in final edited form as: Contemp Clin Trials. 2008 Apr 20;29(5):679–686. doi: 10.1016/j.cct.2008.04.002

Table 3.

Comparison of Program Participants Given a Choice of Intervention Format and Participants Randomized to an Intervention Format (No Choice) (Total number of observations = 2661)

	Data Collection Timepoints

Health Outcomes	4-Months Treatment Effect ^a (p-value)	12-Months Treatment Effect ^a (p-value)	18-Months Treatment Effect ^a (p-value)
Functional Status Scores
SIP physical dimension	0.080	−0.239	−0.121
	(0.569)	(0.072)	(0.361)
N^***=2143
SIP psychosocial dimension	−0.381	−0.182	0.079
	(0.016)^**	(0.230)	(0.600)
N=2143
6-minute walk	−29.53	−33.80	−9.91
	(0.253)	(0.182)	(0.700)
N=1403
Cardiac Symptoms
Cardiac symptom number	0.067	0.079	0.338
	(0.589)	(0.504)	(0.004)^*
N=2160
Cardiac symptom frequency	0.046	0.137	0.414
	(0.771)	(0.366)	(0.006)^*
N=2145
Cardiac symptom bother	0.015	0.075	0.434
	(0.925)	(0.626)	(0.004) ^*
N=2154

Controlling for baseline value, age, employment, education and race; outcome on the log-transformed scale except for 6-min walk.

p≤0.01

^**

p≤0.05

^***

N: the number of subjects used in each analysis.