Motivation for Participating in a Weight Loss Program and Financial Incentives: An Analysis from a Randomized Trial

Table 3

Changes in autonomous motivation.

Assessments	All participants		3-Month weight losers		6-Month weight losers
	BL, 3, 6, 12		3, 6		6, 12
Fixed Effects	Coefficient	S.E.	Coefficient	S.E.	Coefficient	S.E.
Intercept	5.13***	0.09	5.33***	0.18	5.30***	0.19
Month	−0.03***	0.01	0.13**	0.04	−0.00	0.02
Intervention	0.06	0.07	0.24	0.13	0.16	0.15
Intervention by month	0.00	0.01	−0.00	0.06	−0.03	0.03
Weight change	−0.08***	0.01	−0.08***	0.02	−0.08***	0.02
(negative values represent losses)
Female	0.39***	0.10	0.25	0.18	0.45*	0.20
(Reference: male)
Random effects (variance components)
Intercept	0.36***	0.04	0.47***	0.10	0.71***	0.11
Residual	0.92***	0.04	0.74***	0.08	0.62***	0.07
Goodness of fit
−2LL	4604.3		1096.3		1068.9
AIC	4620.3		1112.3		1084.9
BIC	4655.0		1139.5		1112.2
Number of observations	1530		370		359
Number of subjects	566		222		222

^∗Significant at 𝑃<.05; **significant at 𝑃<.01; ***significant at 𝑃<.001.