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Table 1 Characteristics of study population

From: Knee cartilage loss in symptomatic knee osteoarthritis over 4.5 years

Characteristic Eligible population (n = 105) Subjects with MRI at 4.5 years (n = 78) Subjects lost to follow-up at 4.5 years (n = 27) p a
Age, years 62.5 (10.7) 63.8 (10.6) 61.6 (11.3) 0.65
Number of women, % 59 (53%) 44 (54%) 17 (63%) 0.50
Height, cm 168 (9.3) 168 (9.2) 167 (9.5) 0.45
Weight, kg 80.1 (15.0) 80.5 (15.3) 79.3 (14.4) 0.72
BMI 28.4 (5.1) 28.4 (4.8) 28.7 (5.9) 0.79
Womac
   Pain 79 (45) 78 (43) 81 (53) 0.82
   Stiffness 38 (23) 37 (21) 42 (28) 0.39
   Function 298 (171) 290 (161) 324 (201) 0.47
   Total 416 (228) 406 (214) 449 (272) 0.49
Kellgren Lawrenceb
   I 11 7 4  
   II 48 35 13  
   III 45 35 10 0.10
Knee anglec, degrees 181 (6) 181 (6) 180 (5) 0.38
Tibial plateau area, mm2
   Medial 2,065 (405) 2,085 (394) 2,008 (438) 0.42
   Lateral 1,358 (257) 1,352 (239) 1,374 (308) 0.73
Cartilage volume at baseline, mm3
   Medial 1,754 (500) 1,780 (513) 1,676 (459) 0.33
   Lateral 1,945 (580) 1,946 (576) 1,946 (602) 0.98
Annual cartilage loss over first period, %
   Medial 4.3 (6.3) 4.3 (6.5) 4.3 (7.4) 0.87
   Lateral 4.7 (6.8) 4.1 (5.9) 6.1 (4.6) 0.15
  1. Results are reported as mean (SD), except where variables are categorical. Body mass index (BMI) is measured as weight in kilograms divided by the square of height in metres; WOMAC, Western Ontario and McMaster University Osteoarthritis Index. aThe p value for difference between subjects who had undergone baseline magnetic resonance imaging (MRI) and had subsequently completed 5-year MRI and those who did not complete 5-year follow-up. Comparisons made with Student's t test or χ2, for categorical variables, or Eta test for categorical variable by nominal. bOne X-ray was lost after study began. cAngles available for 96 subjects.