Table 1. Comparison between the low back and knee pain groups in pain intensity, PCS and HADS.

		Low back pain	Knee pain
	Age (years)	58.1 ± 18.7	68.5 ± 9.7
	Height (cm)	159.3 ± 8.4	157.7 ± 7.9
	Weight (kg)	59.6 ± 9.4	61.6 ± 11.5
Pain	VAS (mm)	45.2 ± 21.4	38.6 ± 21.0
PCS	Rumination (points)	12.00 ± 5.14	11.00 ± 6.01
	Magnification (points)	7.79 ± 4.89	6.50 ± 4.20
	Helplessness (points)	6.14 ± 2.21	4.79 ± 3.68
HADS	Anxiety (points)	6.57 ± 2.41	5.71 ± 2.84
	Depression (points)	5.71 ± 2.61	5.86 ± 3.23

PCS: Pain catastrophizing scale; HADS: Hospital anxiety and depression scale; VAS: Visual analogue scale. Unpaired t-test. Mean ± standard deviation.