Table 4.

Summary of multiple regression results predicting change in average step counts.

Model parameter	b	Standard error (b)	Beta	P
Intercept	−139.97	98.39	-	.16
Time	−24.98	15.84	−0.018	.12
Baseline physical activitya	−0.13	0.01	−0.239	<.001
Group: financial incentivesb	3.71	80.30	.002	.96
Group: charitable incentivesb	5.42	81.85	.001	.95
Feedback signc	−84.28	78.74	−0.062	.28

^aBaseline physical activity was centered before entering the model.

^bGroup membership was represented as 2 dummy variables with the control group serving as the reference group.

^cFeedback sign was represented as 1 dummy variable with negative feedback serving as the reference group.