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Table 4 Comparison of corneal thickness and epithelial thickness parameters between the non-allergic conjunctivitis (NAC) and allergic conjunctivitis (AC) groups

From: Corneal biomechanical changes in allergic conjunctivitis

Parameter NAC (μm) AC (μm) pa
Mean ± SD Mean ± SD
Corneal total thickness
 2 mm 536.95 ± 24.00 536.20 ± 25.62 0.92
 2–5 mm 562.36 ± 23.53 560.78 ± 26.48 0.83
 5–7 mm 600.33 ± 26.50 599.13 ± 27.23 0.88
 7–9 mm 643.36 ± 31.24 641.08 ± 29.18 0.79
 5 mm min 531.05 ± 24.28 530.40 ± 25.36 0.93
 5 mm min-max −64.10 ± 7.22 −63.67 ± 11.87 0.89
Corneal epithelial thickness
 2 mm 52.25 ± 2.24 51.07 ± 3.54 0.19
 2–5 mm 52.67 ± 1.91 50.44 ± 3.10 0.01
 5–7 mm 52.18 ± 2.32 50.20 ± 3.41 0.03
 7–9 mm 50.48 ± 2.66 49.87 ± 3.38 0.50
 7 mm min 47.80 ± 3.68 44.47 ± 4.42 0.01
 7 mm max 55.60 ± 2.89 55.23 ± 3.84 0.72
 7 mm min-max −8.25 ± 4.91 −10.87 ± 5.21 0.08
 7 mm SD 1.53 ± 0.69 2.26 ± 1.10 0.01
  1. NAC = non-allergic conjunctivitis; AC = allergic conjunctivitis; SD = standard deviation; min = minimum; max = maximum; min-max = the difference between minimum and maximum
  2. a Independent samples t-test