Table 1.

Model fit and estimated model parameters.

Name of the Fixed Parameter	Fixed Effects			Name of the Random Parameter	Random Effects			AIC
	β	LL	UL		Intercept	Change 1	Change 2	ICC	Estimates
Bedtime routine									No growth	9,943.33
Intercept	63.65	59.76	67.55	Intercept	146.76			0.33	Linear	9,941.68
Change 1	−0.31	−0.55	−0.06	Change 1	NS	NS			Quadratic	9,941.99
Change 2	0.1	−0.43	0.63	Change 2	0.26	NS	2.04		Piecewise	9,870.66
Sleep quantity									No growth	4,577.82
Intercept	11.04	10.85	11.22	Intercept	0.5			0.08	Linear	4,516.15
Linear	0.11	0.06	0.16	Linear	0.55	0.01			Quadratic	4,512.9
Quadratic	0.01	0.00	−2.69e−4	Quadratic	NS	NS	NS		Piecewise	4,516.11
Sleep quality									No growth	9,539.79
Intercept	65.18	62.57	67.8	Intercept	62.92			0.24	Linear	9,472.02
Change 1	0.41	0.03	0.79	Change 1	0.4	0.3			Quadratic	9,458.58
Change 2	−0.02	−0.32	0.27	Change 2	0.1	0.29	1.06		Piecewise	9,457.28

β = regression coefficient, LL = lower limit, UL = upper limit, ICC = intraclass correlation coefficient, AIC = akaike information criterion, NS = nonsignificant.