Racial differences in associations between baseline patterns of radiographic osteoarthritis and multiple definitions of progression of hip osteoarthritis: the Johnston County Osteoarthritis Project

Table 3 Hip OA progression by individual definitions

OA progression indicators	All participants	Caucasian	AA	P ^a
OA progression indicators	n (%)	n (%)	n (%)	P ^a
Radiographic OA progression^b (n = 2,803 hips)	411 (14.7)	332 (16.0)	79 (10.8)	0.0007
Range of motion progression^c (n = 2,644 hips)	404 (15.3)	279 (14.0)	125 (19.3)	0.0012
Incident hip replacement at T1 (n = 2,843 hips)	12 (0.4)	10 (0.5)	2 (0.3)	0.742^d
Disability progression^e (n = 1,401 participants)	445 (31.8)	302 (29.0)	143 (39.7)	<0.0001
Any progression (n = 2844 hips)	1,406 (49.4)	1,003 (47.6)	403 (54.8)	0.0008

^aChi-square or Fisher’s exact test p value comparing Caucasians to African Americans (AA). ^bKellgren–Lawrence grade increased by at least 1 from time point 0 (T0) to time point 1 (T1). ^cInternal rotation decrease ≥10° in one or both hips. ^dFisher’s exact test p value. ^eHealth assessment questionnaire score increase > =0.2. OA osteoarthritis

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