TABLE 3—

Final Piecewise Model, With Covariates, for Growth Trajectories in Sexual Risk Behavior in Adolescence and Young Adulthood: Flint, Mich, 1994–2003

Covariates	Coefficient (SE)	Average t ratio	Reliability, λ
Fixed Effects
Mean score at wave 1, π0			0.59
Base, b00	−0.06 (0.06)	−0.95
Age, b01	0.30 (0.05)	6.13***
White, b02	−0.61 (0.09)	−7.04***
Female, b03	−0.44 (0.07)	−6.02***
Female × White, b04	0.42 (0.12)	3.33***
Mean growth at wave 1, π1			0.26
Base, b10	−0.16 (0.07)	−2.49*
Age, b11	−0.05 (0.02)	−2.73**
Female, b12	0.34 (0.08)	4.11***
Mean acceleration during adolescence, π2			0.22
Base, b20	0.07 (0.02)	3.30**
White, b21	0.05 (0.01)	4.50***
Female, b22	−0.07 (0.03)	−2.65**
Mean growth at wave 5, π3			0.31
Base, b30	0.24 (0.06)	4.20***
Age, b31	−0.16 (0.05)	−2.98***
White, b32	0.38 (0.12)	3.06**
Female, b33	0.15 (0.07)	2.08*
Female × White, b34	−0.42 (0.15)	−2.79**
White × age, b35	−0.24 (0.11)	−2.19*
Mean acceleration during young adulthood, π4			.22
Base, b40	−0.06 (0.01)	−4.48***
Age, b41	0.02 (0.01)	1.92
White, b42	−0.07 (0.03)	−2.47*
Female, b43	−0.04 (0.02)	−2.20*
Female × White, b44	0.09 (0.04)	2.61*
White × age, b45	0.06 (0.03)	2.23*

*P < .05; **P < .01; ***P < .001.