Table 2.

Baseline, practice, and final model parameters (N = 44).

Model parameters	Baseline model			Practice model			Final model
	Estimate	SE	p	Estimate	SE	p	Estimate	SE	p
Fixed effects:
Intercept	5.40	0.64	0.000	6.54	0.67	0.000	6.08	0.73	0.000
Linear time	−0.07	0.02	0.002	−0.07	0.02	0.003	−0.05	0.02	0.038
Age centered at median (0 = 23)	-	-	-	−0.28	0.08	0.002	−0.26	0.09	0.008
Daily practice > 12min	-	-	-	−2.26	0.78	0.006	−1.83	0.87	0.044
Within-person BDI	-	-	-	-	-	-	0.27	0.04	0.000
Between-person BDI centered at mean (0 = 8)	-	-	-	-	-	-	0.09	0.08	0.289
Variance components:
Intercept variance	11.53	4.03	0.004	5.30	2.65	0.046	6.06	3.34	0.070
Residual variance	6.73	0.56	0.000	6.73	0.59	0.000	7.38	0.85	0.000
Intercept-linear covariance	−0.42	0.36	0.247	−0.35	0.34	0.308	−0.10	0.10	0.297
Linear slope variance	0.11	0.49	0.025	0.13	0.06	0.020	0.01	0.00	0.083
Quadratic intercept variance	0.01	0.01	0.512	0.01	0.01	0.453	-	-	-
Intercept-quadratic covariance	0.00	0.00	0.028	0.00	0.00	0.022	-	-	-
Quadratic slope variance	0.00	0.00	0.026	0.00	0.00	0.023	-	-	-
ML model fit:
-2LL	2022.5			1816.6			1153.6
AIC	2040.5			1838.6			1173.6
BIC	2076.3			1881.3			1207.7
Number of parameters	9			11			10
Fit change:
Absolute -2LL difference				205.9			663
DF difference				2			1
Exact p value				0.000			0.000

Bolded numbers are statistically significant parameters with p < 0.05