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Table 1 Demographic characteristics

From: Associations between biomarkers of bone and cartilage turnover, gender, pain categories and radiographic severity in knee osteoarthritis

Demographic baseline characteristics
Parameter N = 1241
Sex, n (%)
 Male 399 (32.2)
 Female 842 (67.8)
Age (years)
 Mean (SD) 64.6 (6.6)
 Median (min, max) 64.5 (50.4–80.4)
Race, n (%)
 Caucasian 1110 (89.4)
 Asian 130 (10.5)
 Other 1 (0.1)
BMI, kg/m2
 Mean (SD) 28.9 (4.7)
WOMAC pain (0–100), target knee (SD) 47.5 (14.6)
WOMAC pain (0–100), non-target knee (SD) 35.7 (22.3)
Knee OA, n (%)
 Unilateral, early 44 (3.5)
  KL 0/2 44 (3.5)
  KL 0/1 0 (0)
 Unilateral, late 1 (< 0.1)
  KL 0/3 1 (< 0.1)
  KL 0/4 0 (0)
 Bilateral, early 851 (68.6)
  KL 1/2 221 (17.8)
  KL 2/2 630 (50.8)
 Bilateral, early/late 250 (20.1)
  KL 1/3 20 (1.6)
  KL 1/4 0 (0)
  KL 2/3 212 (17.1)
  KL 2/4 18 (1.5)
 Bilateral late/late 95 (7.7)
  KL 3/3 80 (6.4)
  KL 3/4 15 (1.2)
  KL 4/4 0 (0)
  1. BMI body mass index, KL Kellgren-Lawrence, JSW joint space width, WOMAC Western Ontario and McMaster Universities Osteoarthritis Index, OA osteoarthritis