Table 3.

Logistic Growth Models for Boys’ and Girls’ Genital or Breast and Pubic Hair Development

Parameter	Boys				Girls
	Genital (N = 364)		Pubic hair (N = 364)		Breast (N = 373)		Pubic hair (N = 370)
	Estimate	SE	Estimate	SE	Estimate	SE	Estimate	SE
Fixed effects
Timing, γ10	12.893**	0.051	13.273**	0.046	12.083**	0.057	12.208**	0.055
Tempo, γ00	0.847**	0.017	1.041**	0.020	0.777**	0.015	0.865**	0.015
Lower asymptote, β0	1		1		1		1
Upper asymptote, β1	5		5		5		5
Random effects
Timing variance, ${\mathrm{\sigma }}_{u1}^2$	0.799**	0.078	0.859**	0.081	1.117**	0.099	1.109**	0.097
Tempo variance, ${\mathrm{\sigma }}_{u0}^2$	0.068**	0.011	0.132**	0.020	0.054**	0.009	0.047**	0.008
Timing–tempo covariance, σu0,u1	−0.101**	0.021	−0.081**	0.030	0.004	0.023	0.008	0.024
Residual variance, ${\mathrm{\sigma }}_r^2$	0.190**	0.008	0.172**	0.007	0.219**	0.008	0.197**	0.008
Fit statistics
−2 log-likelihood	3109.1		3108.1		3743.8		3490.4
AIC	3121.1		3120.1		3755.8		3502.4

^**p < .01.