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

Table 1 Sample characteristics

	Total sample (n= 2,092)*	Subset with all radiographs (n= 1,373)
	Mean (SD) or n (%)	Mean (SD) or %
Age (years)	65.1 (10.9)	67.3 (9.7)
BMI (kg/m ² )	31.3 (7.1)	30.8 (6.4)
Male	695 (33.2)	472 (34.4)
African American	709 (33.9)	438 (31.9)
DIP OA ^†	902 (43.2)	637 (46.4)
PIP OA	595 (28.5)	419 (30.5)
MCP OA	195 (9.4)	132 (9.6)
CMC1 OA	577 (27.7)	416 (30.3)
TFJ OA	822 (39.8)	554 (40.4)
PFJ Ost > = 2	174 (11.8)	142 (10.3)
Hip OA	643 (33.8)	475 (34.9)^§
LS OA ^‡	1,138 (59.2)	836 (60.9)

*For total sample (at least one radiograph, see Figure), For LS OA n = 1,923; 2,068 for TFJ OA; 1,901 for Hip OA; 1,481 for PFJ Ost; 2,088 for DIP and PIP OA; 2,086 for MCP and CMC OA
^†Where OA is defined as KL grade > = 2 at any DIP, PIP, CMC, MCP, TFJ, or hip joint
^‡Defined as having at least one lumbar level (L1/2 to L5/S1) with both ost and DN OARSI grade > = 1
^§Hip OA n = 1,360
BMI, body mass index; CMC, carpometacarpal joint; DIP, distal interphalangeal joint; LS, lumbosacral spine; MCP, metacarpophalangeal joint; OA, osteoarthritis; OST, osteophytes; PFJ, patellofemoral joint; PIP, proximal interphalangeal joint; SD, standard deviation; TFJ, tibiofemoral joint.

ISSN: 1478-6362