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Table 2 Hip features of study participants at baseline

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

Hip radiographic feature at baseline All participants Caucasian AA P a
n = 1422 n = 1054 n = 368  
KL grade     
 0: No hip OA % 15.3 17.3 9.5 <0.0001b
 1: Questionable hip OA % 61.6 59.3 68.5  
 2: Mild hip OA % 21.6 22.2 19.7  
 3: Moderate hip OA % 1.3 1.1 1.9  
 4: Severe hip OA % 0.2 0.1 0.4  
JSN     
 Axial     
  None % 77.7 75.9 82.9 <0.0001
  Mild % 21.6 23.7 15.7  
  Moderate/severe % 0.7 0.4 1.4  
 Superior     
  None % 91.6 92.7 88.5 0.0011
  Mild % 7.8 6.9 10.4  
  Moderate/severe % 0.6 0.4 1.1  
 Medial     
  None % 98.2 98.2 98.1 0.8599b
  Mild % 1.8 1.7 1.9  
  Moderate/severe % 0.1 0.1 0  
Subchondral     
 Cysts % 4.1 3.9 4.5 0.5193
 Sclerosis % 14.1 14.5 13.1 0.3337
Medial osteophytes     
 Severity     
  None % 92.1 92.6 90.8 0.2221
  Mild % 6.8 6.3 8.2  
  Moderate/severe % 1.1 1.1 1.0  
 Location     
  None % 92.2 92.6 91.0 0.0353
  Acetabular only % 2.9 2.4 4.4  
  Femoral only % 3.5 3.7 3.0  
  Both % 1.4 1.3 1.6  
Lateral osteophytes     
 Severity     
  None % 42.8 46.0 33.9 <0.0001
  Mild % 48.6 46.5 54.6  
  Moderate/severe % 8.5 7.5 11.4  
 Location     
  None % 42.8 46.0 33.7 <0.0001
  Acetabular only % 40.8 38.2 48.1  
  Femoral only % 4.7 5.1 3.6  
  Both % 11.7 10.7 14.7  
  1. aChi-square or Fisher’s Exact p-value comparing Caucasians to African Americans (AAs). bFisher’s exact test p value. KL Kellgren–Lawrence, OA osteoarthritis, JSN joint space narrowing