Table 6.

Factor Mean Estimates in the Piecewise model

Model Name	Class (%)	Intercept (SE)	Slope (SE)	Intercept (SE)	Slope (SE)
		Age 12	Age 7–12	Age 12–14	Age 14–18
Male
Random intercept
1 Class	1	.64 (.04)	.00 (.01)	−.39 (.08)	.02 (.03)
2 Class	76	−.42 (.14)	−.09 (.02)	.32 (.18)	.17 (.06)
	24	3.2 (.30)	.18 (.04)	−2.1 (.29)	−.34 (.15)
Female
Random intercept
1 Class	1	.76 (.04)	−.01 (.01)	.99 (.07)	.10 (.02)
2 Class	61	−.37 (.13)	−.08 (.02)	1.6 (.15)	.34 (.10)
	39	2.7 (.37)	.09 (.03)	.03 (.27)	−.26 (.10)

Piecewise intercept and slope estimates (standard errors, SE) for males and females for the single and two class models. The first intercept was centered at age 12, and the second intercept is the mean difference between ages 12 and 14. Estimates are on the standard normal liability scale.