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Table 1 Characteristics of the study population

From: Relationship between body adiposity measures and risk of primary knee and hip replacement for osteoarthritis: a prospective cohort study

  Primary knee replacement (n = 541) Primary hip replacement (n = 468) No primary joint replacement (n = 38,014)
Age of entering the MCCS (years) 60.3 ± 6.8 59.7 ± 7.1 54.8 ± 8.6
Age of entering the JR cohort (years) 68.1 ± 6.9 67.3 ± 7.2 62.6 ± 8.8
Age on JR (years) 70.7 ± 6.9 70.1 ± 7.2  
Women, number (%) 344 (63.6) 283 (60.5) 22,699 (59.7)
Height (cm) 164.7 ± 9.9 165.7 ± 8.8 165.0 ± 9.3
Weight (kg) 80.7 ± 14.9 75.5 ± 13.2 73.1 ± 13.6
Body mass index (kg/m2) 29.8 ± 5.1 27.5 ± 4.3 26.8 ± 4.4
Waist circumference (cm) 91.7 ± 12.8 86.3 ± 12.7 85.1 ± 12.8
Waist-to-hip ratio 0.85 ± 0.09 0.84 ± 0.10 0.84 ± 0.09
Fat mass (kg) 32.3 ± 10.4 27.8 ± 9.1 26.0 ± 9.1
Percentage fat (%) 39.7 ± 8.6 36.5 ± 8.3 35.3 ± 8.6
Country of birth, number (%)    
   Australia 429 (79.3) 383 (81.8) 25,977 (68.3)
   United Kingdom 41 (7.6) 32 (6.8) 2,774 (7.3)
   Italy 45 (8.3) 39 (8.3) 4,999 (13.2)
   Greece 26 (4.8) 14 (3.0) 4,264 (11.2)
Education level, number (%)    
   Primary school 85 (15.8) 50 (10.7) 7,107 (18.8)
   Some high school 255 (47.3) 192 (41.2) 14,422 (38.2)
   Completed high school 112 (20.8) 102 (21.9) 7,814 (20.7)
   Degree/diploma 87 (16.1) 122 (26.2) 8,426 (22.3)
  1. Data reported as the mean ± standard deviation, except where indicated. MCCS, Melbourne Collaborative Cohort Study; JR, joint replacement.