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Table 2 Participant characteristics

From: Associations between systemic bone mineral density and early knee cartilage changes in middle-aged adults without clinical knee disease: a prospective cohort study

Characteristic Value
Baseline  
 Number of participants 153
 Age, years 46.7 (9.3)
 Female, n (%) 125 (81.7)
 Body mass index, kg/m2 32.4 (8.9)
   Range 16.9 to 54.9
 Obesity, n (%) 82 (53.6)
 WOMAC, median  
   Pain (out of 500) 15
   Stiffness (out of 200) 5
   Function (out of 1700) 52
 Strenuous physical activity, n (%) 119 (77.8)
 Bone mineral density  
  Total body
   Bone mineral density, g/cm2 1.24 (0.10)
   T-score 1.18 (1.22)
   T-score, range −1.90 to 4.40
   Osteopenia, n (%)/osteoporosis, n (%) 4 (2.6)/0 (0)
  Spine
   Bone mineral density, g/cm2 1.26 (0.17)
   T-score 0.46 (1.44)
   T-score, range −2.30 to 4.80
   Osteopenia, n (%)/osteoporosis, n (%) 19 (12.4)/0 (0)
  Total hip
   Bone mineral density, g/cm2 1.09 (0.16)
   T-score 0.63 (1.29)
   T-score, range −2.40 to 4.50
   Osteopenia, n (%)/osteoporosis, n (%) 13 (8.5)/0 (0)
  Tibial cartilage volume, mm3
   Medial 996 (252)
   Lateral 1299 (369)
  Tibiofemoral cartilage defects, n (%)
   Medial 96 (62.7)
   Lateral 135 (88.2)
  Tibial bone area, mm2
   Medial 1888 (254)
   Lateral 1455 (211)
Change  
  Number of participants 139
  Annual change in tibial cartilage volume, %
   Medial 1.5 (1.7)
   Lateral 1.0 (1.5)
  Progression of tibiofemoral cartilage defects, n (%)
   Medial 23 (16.5)
   Lateral 26 (18.7)
  1. Results displayed as mean (standard deviation) unless otherwise stated. WOMAC Western Ontario and McMaster University Osteoarthritis Index