Table 1.

Subject Characteristics.

Characteristics	Controls (n = 168)	AKOA (n = 106)	P a
Age, years, mean ± SD	59.8 ± 8.2	63.3 ± 8.5	0.001 b
Gender, n (%)			0.796 c
Female	108 (64)	70 (66)
Male	60 (36)	36 (34)
Body mass index, kg/m2, mean ± SD	29.1±4.5	29.4±4.2	0.633 b
PASE, mean ± SD	178.4±82.6	167.8±91.7	0.335 b
Race, n (%)			0.198 c
Caucasian	138 (82)	92 (87)
African American	23 (14)	12 (13)
Asian	4 (2)	0 (0)
Other	3 (2)	0 (0)
Characteristics of OA knees, n (%)
History of knee injury occurring
Before index time point	47 (28)	30 (28)	1.000 c
During follow-up period	27 (16)	46 (43)	<0.001 c
History of knee surgery occurring
Before index time point	10 (6)	2 (2)	0.137 c
During follow-up period	13 (8)	24 (23)	0.001 c
WOMAC pain scores, mean ± SD	1.9±2.5	2.4±2.9	0.151 b
WOMAC stiffness scores, mean ± SD	1.4±1.4	1.8±1.6	0.038 b

OA, osteoarthritis; AKOA, accelerated knee osteoarthritis; PASE = Physical Activity Score for the Elderly; WOMAC = Western Ontario and McMaster Universities Osteoarthritis Index.

^aSignificant values are in boldface.

^bT test.

^cPearson’s chi-square test.