Table 3.

Class differences in demographic characteristics and pain/health outcomes.

Variable	Class 1 (n=148) “Higher CCI Scores”	Class 2 (n=854) “Knee Joint Tenderness”	Class 3 (n=337) “Psychological Distress”	Class 4 (n=2155) “Mild OA”	F (p-value)	χ2(3) (p-value)
Women, %	52.7 a	78.8 b	64.7 c	51.0 a		202.07 (p<0.0001)
Age, years	69.5 ± 9.0 a	65.8 ± 9.0 b	63.9 ± 9.4 c	64.4 ± 8.9 c	19.71 (p<0.0001)
WOMAC score	27.5 ± 19.9 a	20.2 ± 15.6 b	32.5 ± 20.5 c	10.4 ± 12.2 d	307.57) (p<0.0001)
Knee pain, NPRS	5.1 ± 2.9 a	4.3 ± 2.6 b	6.0 ± 2.8 c	2.9 ± 2.5 d	185.81 (p<0.0001)
Walking speed (m/s)	1.13 ± 0.22 a	1.26 ± 0.21 b	1.18 ± 0.23 c	1.35 ± 0.20 d	110.68 (p<0.0001)
Currently seeking healthcare for arthritis, %	8.8 a	13.4 b	17.5 b	5.4 a		87.32 (p<0.0001)

WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index

NPRS: Numeric Pain Rating Scale (knee pain)

Note: Values sharing a common subscript letter (i.e., _{a, b, c, d}) failed to differ significantly at alpha = 0.05 in post hoc testing.