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Table 1 Demographic and clinical characteristics of baseline study participants

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

  All participants Caucasian AA P value
Baseline demographic characteristics n = 1422 n = 1054 n = 368  
Age, mean (SD), years 61.4 (9.0) 61.4 (8.8) 61.5 (9.4) 0.6967
BMI, mean (SD), kg/m2 28.9 (5.4) 28.3 (4.9) 30.6 (6.2) <0.0001
 <25 % 23.1 26.3 14.0 <0.0001
 25 – <30 % 41.3 41.6 40.7  
 30+ % 35.5 32.2 45.3  
Gender, % women 60.0 56.8 69.0 <0.0001
Educational attainment < HS, % 33.0 28.3 46.3 <0.0001
Smoking     
 Never % 51.2 49.4 56.3 <0.0001
 Past % 32.0 35.2 22.8  
 Current % 16.8 15.4 20.9  
Hip injury, % 2.4 2.3 2.6 0.5723
CES-D <16, % 8.0 7.4 9.9 0.0315
HAQ, mean (SD), score 0.3 (0.5) 0.3 (0.5) 0.3 (0.5) 0.1992
Follow-up time, mean (SD), years 6.0 (1.4) 5.8 (1.3) 6.5 (1.4) <0.0001
  1. AA African American, BMI body mass index, HS high school, CES-D Center for Epidemiologic Studies depression scale, HAQ health assessment questionnaire