Table 3.

Simple Linear Regression between KL grade and pain intensity, physical function and quality of life.

Dependent Variable	Adjusted R2	KL grade∗∗	B	SE B	p-value
BPI pain score	0.081	Intercept	4.269	0.273	<0.001
		II	0.301	0.368	0.415
		III	0.047	0.373	0.899
		IV	1.463	0.462	0.002∗
SF12-PCS	0.129	Intercept	37.616	1.629	<0.001
		II	-3.310	2.193	0.134
		III	-8.337	2.225	<0.001∗
		IV	-8.596	2.753	0.002∗
WOMAC function subscale	0.116	Intercept	30.077	2.186	<0.001
		II	2.829	2.943	0.339
		III	6.623	2.987	0.029∗
		IV	14.066	3.695	<0.001∗

Abbreviations: KL: Kellgren-Lawrence; BPI: Brief Pain Inventory; SF12-PCS: Physical Component Summary of 12-Item Short Form Health Survey scale; WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index.

^∗∗Note: KL I was used as the reference variable in the regression.