Table 6.

The results of the intervention effects on the 9-month spelling score.

Model	Method	Estimate	S.E.	$95\text{\%}$ confidence interval	p-value
1	${\text{GEE}}_{\text{ind}}$	1.766	0.4813	(0.823, 2.709)	0.00024
	${\text{GEE}}_{\text{exc}}$	1.758	0.4819	(0.813, 2.703)	0.00026
	${\text{QIF}}_{\text{ind}}$	1.766	0.4813	(0.822, 2.709)	0.00024
	${\text{QIF}}_{\text{ind}-\text{MD}}$	1.766	0.4913	(0.803, 2.728)	0.00033
	${\text{QIF}}_{\text{ind}-\text{KC}}$	1.766	0.4863	(0.812, 2.719)	0.00028
	${\text{QIF}}_{\text{exc}}$	1.797	0.4748	(0.866, 2.727)	0.00015
	${\text{QIF}}_{\text{exc}-\text{MD}}$	1.797	0.4847	(0.847, 2.747)	0.00021
	${\text{QIF}}_{\text{exe}-\text{KC}}$	1.797	0.4797	(0.856, 2.737)	0.00018
2	${\text{GEE}}_{\text{ind}}$	1.811	0.4758	(0.878, 2.744)	0.00014
	${\text{GEE}}_{\text{exc}}$	1.842	0.4774	(0.906, 2.778)	0.00011
	${\text{QIF}}_{\text{ind}}$	1.811	0.4758	(0.879, 2.744)	0.00014
	${\text{QIF}}_{\text{ind}-\text{MD}}$	1.811	0.4943	(0.842, 2.780)	0.00025
	${\text{QIF}}_{\text{ind}-\text{KC}}$	1.811	0.4849	(0.861, 2.762)	0.00019
	${\text{QIF}}_{\text{exc}}$	2.056	0.4583	(1.158, 2.955)	0.00001
	${\text{QIF}}_{\text{exc}-\text{MD}}$	2.056	0.4734	(1.128, 2.984)	0.00001
	${\text{QIF}}_{\text{exc}-\text{KC}}$	2.056	0.4659	(1.143, 2.969)	0.00001
3	${\text{GEE}}_{\text{ind}}$	1.413	0.2868	(0.851, 1.975)	$8.4\times {10}^{-7}$
	${\text{GEE}}_{\text{exc}}$	1.446	0.2934	(0.871, 2.021)	$8.3\times {10}^{-7}$
	${\text{QIF}}_{\text{ind}}$	1.413	0.2868	(0.851, 1.975)	$8.4\times {10}^{-7}$
	${\text{QIF}}_{\text{ind}-\text{MD}}$	1.413	0.2980	(0.829, 1.997)	$2.1\times {10}^{-6}$
	${\text{QIF}}_{\text{ind}-\text{KC}}$	1.413	0.2924	(0.840, 1.986)	$1.3\times {10}^{-6}$
	${\text{QIF}}_{\text{exc}}$	1.601	0.2817	(1.049, 2.153)	$1.3\times {10}^{-8}$
	${\text{QIF}}_{\text{exc}-\text{MD}}$	1.601	0.2922	(1.028, 2.173)	$4.3\times {10}^{-8}$
	${\text{QIF}}_{\text{exc}-\text{KC}}$	1.601	0.2872	(1.038, 2.164)	$2.5\times {10}^{-8}$