Table 2.

Latent Growth Curve Model Parameter Estimates

	1-Class Model	2-Class Model	3-Class Model
Coefficient (Units)	coef (se); p-value	coef (se); p-value	coef (se); p-value
Intercept
Class 1	131.1 (.52);<.001	136.0 (.42); <.001	137.7 (.35);<.001
Class 2		124.1 (.91);<.001	128.6 (.63); <.001
Class 3			112.5 (1.94);<.001
Education* (Yrs)	1.33 (.20); <.001	.94(.16);<.001	.54(.10);<.001
Baseline Age** (Yrs)	−.30 (.05); <.001	−.11 (.04); .003	−.07 (.03); .010
SCZ (−.5, .5)***	−7.52 (1.21);<.001	−3.89(.86):<.001	−3.36(.63);<.001
Change in Age (Yrs)
Class 1	−.41 (.18); .011	−.13 (.14); .187	.03 (.14); .597
Class 2		−.89 (.41); .015	−.43 (.25); .042
Class 3			−2.11 (1.03); .020
Error Standard Deviation
Class 1	5.19	3.10	2.61
Class 2		9.75	6.12
Class 3			12.82
Number of Subjects
Class 1	268	191	137
Class 2		77	102
Class 3			29
DIC	6961	6879	6730

^*Centered by subtracting the sample mean years of education (13.2 years)

^**Centered by subtracting the sample mean baseline age (56.1 years)

^***HC subjects coded as −.5, SCZ patients coded as .5