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Table 2 Average gray level of SIRT1 in the OA and control groups (mean ± SD)

From: The expression of SIRT1 in articular cartilage of patients with knee osteoarthritis and its correlation with disease severity

Group Sample (n) Average gray level
Normal 9 104.14 ± 8.30
OA   
 Mild 10 125.94 ± 10.71a
 Moderate 13 133.22 ± 9.62a,b
 Severe 15 163.07 ± 9.78a,c,d
 Total 38 143.09 ± 19.23a
  1. a P < 0.05, versus normal group
  2. b P > 0.05, versus mild group
  3. c P < 0.05, versus mild group
  4. d P < 0.05, versus moderate group