Table 7.

Pair-wise comparison of mean EI using post hoc Tukey's test

Dependentvariable	(I)Group	(J)Group	Mean difference(I-J)	Std. error	p value
Immediate	1	2	0.556	0.221	0.067
	1	3	-0.111	0.221	0.958
	1	4	-0.167	0.221	0.875
	2	3	-0.667	0.221	0.019
	2	4	-0.722	0.221	0.009
	3	4	-0.056	0.221	0.994
1 Month	1	2	1.098	0.282	0.001
	1	3	0.125	0.273	0.968
	1	4	-0.221	0.277	0.856
	2	3	-0.973	0.282	0.006
	2	4	-1.319	0.287	0.000
	3	4	-0.346	0.277	0.600
3 Months	1	2	1.505	0.273	0.000
	1	3	0.290	0.273	0.712
	1	4	0.005	0.273	1.0
	2	3	-1.214	0.277	0.000
	2	4	-1.500	0.277	0.000
	3	4	-0.286	0.277	0.732
6 Months	1	2	1.686	0.285	0.000
	1	3	0.471	0.285	0.357
	1	4	0.257	0.285	0.803
	2	3	-1.214	0.290	0.001
	2	4	-1.429	0.290	0.000
	3	4	-0.214	0.290	0.880