. Author manuscript; available in PMC: 2016 May 1.

Published in final edited form as: Neuropsychology. 2014 Dec 15;29(3):335–343. doi: 10.1037/neu0000159

Table 2. Estimates of change in cognition from the mixture model (K=4).

	Group 1 (N=389) Estimate (SE, p)	Group 2 (N=304) Estimate (SE, p)	Group 3 (N=114) Estimate (SE, p)	Group 4 (N=69) Estimate (SE, p)
Intercept (μ₀)	.227 (.032, <.001)	-.067 (.048, .162)	.165 (.049, .001)	-.068 (.082, .404)
Variance ( $σ_{1}^{2}$ )	.107 (.013, <.001)	.178 (.024, <.001)	.055 (.024, .020)	.261 (.065, <.001)
Linear (μ₁)	.022 (.007, .002)	.024 (.018, .180)	.073 (.030, .016)	-.133 (.049, .007)
Variance ( $σ_{2}^{2}$ )	.0008 (.0002, <.001)	.007 (.002, <.001)	.018 (.005, <.001)	.028 (.013, .036)
Covariance (σ₁₂)	.002 (.001, .167)	.012 (.004, .003)	.004 (.006, .484)	.007 (.016, .647)
Quadratic (μ₂)	-.002 (.001, .005)	-.012 (.002, <.001)	-.034 (.004, <.001)	-.010 (.004, .013)
Residuals Variance	.031 (.002, <.001)	.055 (.007, <.001)	.090 (.015, <.001)	.355 (.052, <.001)