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Table 4 Intraobserver repeatability outcomes for corneal power obtained using Pentacam Scheimpflug imaging in children

From: The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

Parameter Observer Mean ± SD Sw TRT CoV (%) ICC (95% CI)
Km 1st 43.13 ± 1.44 0.09 0.26 0.21 0.996 (0.994 to 0.997)
2nd 43.14 ± 1.44 0.09 0.26 0.22 0.996 (0.994 to 0.997)
J0 1st −0.71 ± 0.45 0.09 0.25 0.962 (0.945 to 0.974)
2nd −0.70 ± 0.45 0.09 0.25 0.961 (0.944 to 0.974)
J45 1st −0.03 ± 0.21 0.11 0.30 0.766 (0.682 to 0.835)
2nd −0.04 ± 0.22 0.10 0.27 0.832 (0.767 to 0.883)
Nasal 2 mm 1st 42.23 ± 1.40 0.16 0.43 0.37 0.988 (0.982 to 0.992)
2nd 42.25 ± 1.40 0.16 0.43 0.37 0.988 (0.982 to 0.992)
Superior 2 mm 1st 43.84 ± 1.63 0.25 0.69 0.57 0.977 (0.967 to 0.984)
2nd 43.86 ± 1.66 0.23 0.63 0.52 0.982 (0.973 to 0.988)
Temporal 2 mm 1st 42.73 ± 1.37 0.19 0.52 0.44 0.981 (0.973 to 0.987)
2nd 42.74 ± 1.37 0.18 0.50 0.42 0.983 (0.975 to 0.988)
Inferior 2 mm 1st 43.79 ± 1.71 0.25 0.69 0.57 0.979 (0.970 to 0.986)
2nd 43.77 ± 1.68 0.22 0.60 0.50 0.983 (0.976 to 0.989)
Nasal 5 mm 1st 41.94 ± 1.40 0.12 0.32 0.28 0.993 (0.990 to 0.995)
2nd 41.96 ± 1.41 0.11 0.31 0.27 0.994 (0.991 to 0.996)
Superior 5 mm 1st 43.50 ± 1.58 0.35 0.98 0.81 0.952 (0.931 to 0.967)
2nd 43.51 ± 1.61 0.23 0.63 0.53 0.980 (0.971 to 0.987)
Temporal 5 mm 1st 42.48 ± 1.33 0.11 0.29 0.25 0.994 (0.991 to 0.996)
2nd 42.48 ± 1.34 0.10 0.29 0.24 0.994 (0.991 to 0.996)
Inferior 5 mm 1st 43.62 ± 1.56 0.17 0.46 0.38 0.989 (0.983 to 0.992)
2nd 43.60 ± 1.54 0.14 0.38 0.32 0.992 (0.988 to 0.995)
  1. Keratometric data are in units of diopter (D); SD = standard deviation, Sw = within-subject standard deviation, TRT = test-retest repeatability (2.77 Sw), CoV = within-subject coefficient of variation, ICC = intraclass correlation coefficient