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Table 1 Weighted Cohen’s kappa analysis of Hirst and Tan grading systems

From: Cosmetic outcome of femtosecond laser-assisted pterygium surgery

  Intra-rater reliability Inter-rater reliability
Hirst grading system YFL1, YFL2 YCL1, YCL2 YFL1, YCL1 YFL2, YCL2
0.86 (SE 0.06, CI 0.75–0.98) 0.95 (SE 0.03, CI 0.89–1.00) 0.84 (SE 0.06, CI 0.72–0.96) 0.88 (SE 0.05, CI 0.79–0.99)
Tan grading system AJ1, AJ2 YCL1, YCL2 AJ1, YCL1 AJ2, YCL2
0.88 (SE 0.09, CI 0.71–1.00) 0.89 (SE 0.08, CI 0.73–1.00) 0.66 (SE 0.12, CI 0.42–0.91) 0.75 (SE 0.12, CI 0.52–0.98)
  1. AJ and YFL are junior ophthalmology residents; YCL is an experienced ophthalmologist
  2. SE = standard error; CI = 95% confidence interval