Table 3. Differences in model-based vs sandwich-based variance ratios for both GEE and SGEE.

Effect	Corr	GEE		SL-GEE
		Est	V.R	Est	V.R
Intercept	Ind	0.253	1.465	0.176	1.317
	Exch	0.088	1.006	0.024	0.944
	AR(1)	0.119	1.062	0.043	0.952
	Unstr	0.029	0.996	-0.038	0.917
	M-dep	0.129	1.115	0.050	0.997
Breastfed	Ind	-0.057	2.099	-0.062	1.893
	Exch	-0.022	1.051	-0.027	0.997
	AR(1)	-0.052	1.309	-0.058	1.169
	Unstr	-0.027	1.085	-0.031	1.022
	M-dep	-0.051	1.433	-0.057	1.274
BV	Ind	1.086	3.364	1.495	1.458
	Exch	1.049	2.915	1.475	1.275
	AR(1)	1.000	2.911	1.494	1.109
	Unstr	0.901	3.262	1.286	1.578
	M-dep	1.017	3.108	1.513	1.172
BV:Time	Ind	-0.199	2.507	-0.275	1.168
	Exch	-0.198	2.690	-0.277	1.331
	AR(1)	-0.191	2.328	-0.280	0.977
	Unstr	-0.176	2.923	-0.246	1.505
	M-dep	-0.196	2.446	-0.285	1.006
HIV	Ind	0.189	2.968	0.222	2.343
	Exch	0.248	1.436	0.273	1.225
	AR(1)	0.216	1.947	0.253	1.487
	Unstr	0.193	1.634	0.232	1.322
	M-dep	0.212	2.145	0.250	1.626
Male	Ind	-0.370	2.057	-0.382	1.845
	Exch	-0.358	1.027	-0.358	0.989
	AR(1)	-0.359	1.268	-0.369	1.128
	Unstr	-0.319	1.069	-0.329	1.001
	M-dep	-0.363	1.395	-0.373	1.234
Time	Ind	0.178	1.498	0.192	1.344
	Exch	0.146	1.261	0.165	1.137
	AR(1)	0.135	1.132	0.150	1.003
	Unstr	0.110	1.207	0.126	1.090
	M-dep	0.143	1.180	0.156	1.049
Weight	Ind	-0.112	1.538	-0.125	1.365
	Exch	-0.068	1.057	-0.087	0.963
	AR(1)	-0.062	1.120	-0.076	0.979
	Unstr	-0.034	1.098	-0.050	0.988
	M-dep	-0.068	1.189	-0.080	1.042