Table 2.

Optimal binomial model to describe the relationship between intervention use and the achievement of a lasting intervention benefit.

Fixed effects	Estimate (b)	Standard error	Standardized (β)	z score	P value
Intercept	0.47	0.11	.00	4.45	<.001
freqa	-0.20	0.10	-.35	-1.97	<.05
adhb	0.11	0.24	.09	0.45	.66
timec	-0.00	0.00	-.05	-0.37	.72
freq×adh	0.65	0.23	.54	2.88	.004
freq×time	0.01	0.00	.36	2.75	.006

^aFrequency of use (scaled by intervention length).

^bAdherence to the specific instructions of an exercise within the past week (coded as 1=true, 0=false).

^cAssessment time point, in days (range of values before mean centering: 7, 14, 21, 28, 35, 37, 42, 72, 97, and 132).