Table 2.

Covariance analysis of overall improvement rate of two groups at endpoint (FAS)

Source	Degree of freedom	Sum of square (SS) value	Mean square (MS) value	F value	p value
Model	18	37972.548	2109.586	4.48	< 0.001
Error	162	76289.972	470.926
Corrected total	180	114262.520
Baseline values	1	334.775	334.775	0.711	0.400
Randomized study groups	1	512.292	512.292	1.088	0.299
Study sites	8	35312.712	4414.089	9.373	< 0.001
Randomized study groups × study sites	8	1596.195	199.524	0.424	0.906