Table 1 Descriptive statistics and repeatability of Pentacam measurements made on a single day in subjects with keratoconus.

From: An inter-day assessment of the ABC parameters in the evaluation of progressive keratoconus

 

Mean (SD)a

(Min–Max)a

Sw (95% CI)

RC (95% CI)

ICC (95% CI)

CoV (%)

Kendall’s tau-bb

Pb (2-tailed)

Spearman’s rhob

Pb (1-tailed)

(n = 61)

A (mm)

7.02 (0.56)

(5.14–8.10)

0.067 (0.060–0.074)

0.18 (0.17–0.20)

0.99 (0.98–0.99)

0.95

− 0.162

0.07

− 0.246

0.03

B (mm)

5.37 (0.58)

(3.56–6.49)

0.087 (0.078–0.095)

0.24 (0.22–0.26)

0.98 (0.97–0.99)

1.61

− 0.031

0.73

− 0.035

0.39

C (μm)

485.2 (40.5)

(394.5–574.5)

5.47 (4.91–6.03)

15.2 (13.6–16.7)

0.98 (0.97–0.99)

1.13

0.174

0.05

0.265

0.02

  1. A = Anterior curvature of the 3 mm zone over the thinnest point (mm). B = Posterior curvature of the 3 mm zone under the thinnest point (mm). C = Thickness of the thinnest point on the cornea (μm).
  2. aSubject mean.
  3. bSubject SD versus subject mean.
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