Table 3.

The differences of chi-square statistical outcome in percentage of MCID cases between each two groups.

groups	4-week follow-up		8-week follow-up		12-week follow-up
	Chi-Square	P value	Chi-Square	P value	Chi-Square	P value
Group A vs. Group B	4.148	0.042*	5.195	0.023*	2.986	0.084
Group A vs. Group C	4.148	0.042*	10.288	<0.001*	16.542	<0.001*
Group B vs. Group C	–	–	0.978	0.323	6.066	0.014*

The data of percentages was compared by the Chi-squared test. *P<0.05, there were statistically significant difference.