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Table 3 Differential analyses between pterygium grading and three optical quality values

From: Evaluation of optical quality in pterygium patients with a new modified sutureless and glue-free method

  Grade 1
(n = 11)
Grade 2
(n = 19)
Grade 3
(n = 22)
F p
OSI (OSI value) 2.76 ± 1.34 3.89 ± 1.94 8.37 ± 4.16 17.048 0.000
p1 = 0.201 p2 = 0.000 p3 = 0.000   
MTF cut-off (c/deg) 21.16 ± 7.48 18.64 ± 10.93 9.17 ± 6.15 9.893 0.000
p1 = 0.843 p2 = 0.007 p3 = 0.001   
Strehl ratio 0.13 ± 0.038 0.12 ± 0.037 0.10 ± 0.035 1.996 0.147
p1 = 0.515 p2 = 0.168 p3 = 0.069   
  1. p1 Grade 1 vs Grade 2, p2 Grade 2 vs Grade 3, p3 Grade 1 vs Grade 3