Table 5.

Analysis of covariance (ANCOVA) “knee pain” (R2=0.392).

	SSQa	df1	F	P value	η 2	Partial η2
VASb pain score PREc	8395.020	1	51.784	<.001	0.138	0.185
Intervention	12,855.179	1	82.779	<.001	0.211	0.258
Recruiter	2259.651	6	2.185	.04	0.037	0.058
Pain medication	214.351	1	1.391	.24	0.004	0.006
Pain level	164.886	1	0.974	.32	0.003	0.004
Residual	36,984.465	—d	—	—	—	—

^aSSQ: sum of squares.

^bVAS: visual analogue scale.

^cPRE: survey before the first therapy session.

^dNot applicable.