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Table 1 Demographic description of the orthopaedic research in relation to region of development, orthopaedic sub-specialty and level of evidence

From: Heterogeneity of the definition of elderly age in current orthopaedic research

  Median age Range Standard deviation Variance
Development region     
North America (n = 18) 65 50–70 4.93 24.27
Europe (n = 19) 65 50–75 6.39 40.81
Asia (n = 41) 65 50–80 6.29 39.62
South America (n = 1) 65
Africa (n = 1) 65
Sub-specialty     
Trauma (n = 45) 65 50–80 5.88 34.61
Upper limb (n = 4) 62.5 50–65 7.07 50
Pelvis/hip/knees (n = 11) 65 50–75 6.71 50
Spine (n = 19) 65 50–75 5.52 30.52
Foot and ankle (n = 1) 70
Level of evidence     
 I 65 60–67 3.61 13
 II 65 60–75 5.48 30
 III 65 50–80 5.96 35.56
 IV 62.5 50–75 6.21 38.64