Relationship between biological factors and catastrophizing and clinical outcomes for female patients with knee osteoarthritis

Table 3 Spearman’s correlation coefficients between each variable

	Age	BMI	K-L grade	PCS	Pain rating	TUG	JKOM
Age	1.000	-0.144	0.100	-0.023	-0.079	0.170	-0.017
BMI		1.000	0.322b	0.084	0.212	0.257a	0.046
K-L grade			1.000	0.182d	0.281a	0.587d	0.467d
PCS				1.000	0.574d	0.404d	0.594d
Pain rating					1.000	0.487d	0.721d
TUG						1.000	0.588d
JKOM							1.000

Value (ρ): Correlation coefficient. Small letters show the statistical significance:

^aP < 0.05,

^bP < 0.01,

^dP < 0.001. BMI: Body mass index; K-L grade: Kellgren-Lawrence grading system; PCS: Pain Catastrophizing Scale; TUG: Timed up and go test; JKOM: Japanese Knee Osteoarthritis Measure.