Quantification of the whole-body burden of radiographic osteoarthritis using factor analysis

Table 3 Pearson correlation coefficients between factors in the rotated four-factor solution

	IP/CMC factor	MCP factor	Knee factor	Spine factor
IP/CMC factor*	1.0
MCP factor	0.44	1.0
Knee factor	0.30	0.36	1.0
Spine factor	0.24	0.30	0.40	1.0

*IP/CMC factor: Thumb IP, DIP 2-5, PIP 2-5, CMC1; MCP factor: MCP 2-5, Knee factor: TFJ and PFJ; Spine factor: Disc space narrowing and osteophytes L1/2 to L5/S1.
IP, interphalangeal joint; MCP, metacarpophalangeal joint; PFJ, patellofemoral joint; PIP, proximal interphalangeal joint; TFJ, tibiofemoral joint.

ISSN: 1478-6362