. Author manuscript; available in PMC: 2021 Jul 19.

Published in final edited form as: J Int Neuropsychol Soc. 2021 Jul;27(6):637–647. doi: 10.1017/S135561772000096X

Table 2.

Fit indices and estimates for unconditional linear growth models of cannabis use and motivation indices.

	χ²	df	CFI	RMSEA	AIC	SABIC	Intercept $\bar{x}$	Slope $\bar{x}$	Intercept σ²	Slope σ²	Cov (I/S)
CU (continuous)	21.87	10	.98	.05	19685.88	19694.09	.70^**	.56^**	1502.36^**	122.91^**	.08
CU (count)	-	-	-	-	15425.60	15433.80	1.01^**	.71^**	16.59^**	89.41^**	.67^**
AES: Apathy	1.74	1	.99	.05	4712.08	4717.83	6.21^**	−.12	20.85^**	1.48^*	−.21
MES: Disengagement	2.38	1	.99	.06	6169.83	6175.59	7.43 ^**	.22^*	157.61^**	9.47^*	−.51^**
MES: Persistence	6.65^*	1	.94	.13	6332.48	6338.24	6.99^**	.12	217.81^**	11.23^*	−.59^**
MES: Planning	1.60	1	.99	.04	6402.52	6408.28	7.40^**	.44^*	182.96^**	5.66	−.47^*
MES: Self-Belief	.13	1	1.00	.00	6019.23	6024.98	11.42^**	.09	90.09^**	4.65	−.55^**
MES: Valuing School	2.16	1	.99	.06	6330.65	6336.40	6.83^**	.16	217.43^**	6.04	−.32

^**

p < .001,

p <.05.

Variance (σ²) estimates are unstandardized. All other estimates are presented in standardized metric.

Note: CU = cannabis use; AES = Apathy Evaluation Scale; MES = Motivation and Engagement Scale; df = degrees of freedom; CFI = Comparative Fit Index; RMSEA = Root Mean Square Error of Approximation; AIC = Akaike Information Criterion; SABIC = Sample-size Adjusted Bayesian Information Criterion; Cov (I/S) = Covariance between intercept and slope.