Table 2.

WOMAC and P4 Physical Function Pattern Matrix Factor Loadings

Items	Factors
	1	2	3
WOMAC
Difficulty socks on	0.99	−0.28	0.01
Difficulty socks off	0.99	−0.17	−0.05
Difficulty in/out bed	0.78	−0.02	0.08
Difficulty bending to floor	0.75	−0.01	0.09
Difficulty on/off toilet	0.64	0.28	−0.06
Difficulty in/out car	0.59	0.28	−0.02
Difficulty lying in bed	0.59	0.04	0.14
Difficulty light duties	0.55	0.28	0.04
Difficulty heavy duties	0.41	0.37	−0.23
Difficulty up from sitting	0.36	0.31	0.12
Difficulty down stairs	−0.38	0.99	−0.01
Difficulty up stairs	−0.09	0.78	0.13
Difficulty shopping	0.28	0.55	0.00
Difficulty standing	0.25	0.54	0.05
Difficulty sitting	0.38	0.51	−0.09
Difficulty walking	0.32	0.48	0.05
Difficulty in/out bathtub	0.28	0.46	0.00
P4
Pain evening	0.01	−0.04	0.96
Pain afternoon	0.07	−0.09	0.96
Pain morning	0.16	−0.03	0.84
Pain activities	−0.21	0.31	0.78