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Table 1 Characteristics of the study population

From: The determinants of change in tibial plateau bone area in osteoarthritic knees: a cohort study

  Total (n = 126) Men (n = 58) Women (n = 68) P a
Age, years 63.6 ± 10.1 64.2 ± 10.0 63.2 ± 10.3 0.58
Height, cm 167.7 ± 9.1 174.6 ± 6.8 161.8 ± 6.1 <0.001
Weight, kg 81.4 ± 15.5 85.1 ± 14.9 78.3 ± 15.3 0.01
BMI, kg/m2 28.9 ± 5.1 27.8 ± 3.8 29.9 ± 5.8 0.02
WOMAC score 436 ± 224 411 ± 214 457 ± 232 0.25
SF-36 score 98 ± 7 98 ± 6 99 ± 8 0.25
Physical activity 6.2 ± 1.8 6.7 ± 1.7 5.8 ± 1.8 0.01
Time between scans, years 1.95 ± 0.21 1.94 ± 0.19 1.96 ± 0.23 0.58
OA gradeb     
Grade of medial osteophytes     
   <2 107 50 57 0.50
   ≥ 2 18 7 11 0.35
Grade of medial JSN     
   <2 90 35 55 0.04
   ≥ 2 35 22 13 0.13
Grade of lateral osteophytes     
   <2 103 48 55 0.49
   ≥ 2 22 9 13 0.39
Grade of lateral JSN     
   <2 116 55 61 0.58
   ≥ 2 9 2 7 0.10
Tibial plateau area, mm2     
   Medial 2054.6 ± 363.9 2331.1 ± 304.3 1860.2 ± 263.2 <0.001
   Lateral 1407.2 ± 256.7 1533.4 ± 244.9 1328.2 ± 232.8 <0.001
  1. Except where indicated otherwise, values are means ± standard deviations. aMen vs women, by independent t-tests or chi-square test, as appropriate. bValues are the number of subjects in each grade category. One radiograph was lost after the study commenced. BMI, body mass index; JSN, joint-space narrowing.; MRI, magnetic resonance imaging; OA, osteoarthritis; SF-36, 36-Item Short-Form Health Survey; WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index.