Table 3. Correlation coefficient of PCS, HADS and QOL with pain intensity in the low back pain and knee pain groups.

		Low back pain	Knee pain
		r value	r value
	Age	−0.181	−0.147
	Weight	0.191	−0.031
PCS	Rumination	0.324	0.512
	Helplessness	0.152	0.537*
	Magnification	0.256	0.452
HADS	Anxiety	0.543*	0.064
	Depression	−0.098	0.363
QOL	Daily activity	−0.204	—
	Health	−0.165	−0.079
	Human support	0.069	—
	Economic state	0.290	0.002
	Depression	0.153	0.122
	Positive mental attitude	0.359	−0.172

Pearson’s correlation: age, weight, PCS and HADS.

Spearman’s correlation: QOL.

*p<0.05.

QOL: quality of life; PCS: Pain catastrophizing scale; HADS: Hospital anziety and depression scale.