Table 4.

Estimated Coefficients for Quadratic Growth Model of Math and Reading Achievement Scores with Time-Varying Indicator of Mother’s Marital Status

Fixed Effects	Math				Reading
	Coef.	Std. error	t ratio	p	Coef.	Std. error	t ratio	p
Intercept, πoij	6.35	0.21	29.65	<0.001	8.51	0.31	27.73	<0.001
Age, π1ij	23.16	0.23	98.79	<0.001	29.01	0.33	88.64	<0.001
Age2, π2ij	−1.10	0.03	−34.23	<0.001	−1.43	0.04	−32.52	<0.001
Married, π3ij	1.24	0.42	2.94	0.004	2.00	0.62	3.21	0.002
Random Effects	Variance Comp.	df	χ2	p	Variance Comp.	df	χ2	p
Level 1
eti	35.41				63.94
Level 2
Intercept, πoij	32.57	492	643.68	<0.001	66.98	463	614.65	<0.001
Age, π1ij	56.32	492	678.56	<0.001	112.56	463	779.15	<0.001
Age2, π2ij	0.71	492	576.08	0.005	1.39	463	749.37	<0.001
Married, π3ij	17.82	492	532.99	0.098	66.39	463	554.06	0.003