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Table 3 Intraobserver repeatability outcomes for corneal power obtained using CASIA swept-source optical coherence tomography 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 43.34 ± 1.43 0.10 0.28 0.23 0.995 (0.993 to 0.997)
2nd 43.34 ± 1.43 0.11 0.30 0.25 0.994 (0.992 to 0.996)
J0 1st −0.70 ± 0.43 0.11 0.32 0.933 (0.904 to 0.954)
2nd −0.73 ± 0.46 0.13 0.35 0.930 (0.900 to 0.952)
J45 1st 0.00 ± 0.21 0.12 0.34 0.724 (0.630 to 0.804)
2nd 0.01 ± 0.23 0.14 0.37 0.715 (0.618 to 0.797)
Nasal 2 mm 1st 42.57 ± 1.36 0.23 0.64 0.55 0.971 (0.958 to 0.981)
2nd 42.54 ± 1.38 0.25 0.68 0.58 0.969 (0.955 to 0.979)
Superior 2 mm 1st 44.15 ± 1.62 0.26 0.72 0.59 0.975 (0.964 to 0.983)
2nd 44.20 ± 1.65 0.36 1.00 0.82 0.953 (0.933 to 0.969)
Temporal 2 mm 1st 42.73 ± 1.37 0.25 0.70 0.59 0.967 (0.953 to 0.978)
2nd 42.72 ± 1.38 0.24 0.68 0.57 0.969 (0.956 to 0.979)
Inferior 2 mm 1st 43.94 ± 1.62 0.31 0.85 0.70 0.965 (0.949 to 0.976)
2nd 43.97 ± 1.65 0.25 0.70 0.58 0.977 (0.966 to 0.984)
Nasal 5 mm 1st 41.92 ± 1.38 0.25 0.69 0.59 0.968 (0.954 to 0.979)
2nd 41.91 ± 1.39 0.29 0.80 0.69 0.958 (0.940 to 0.972)
Superior 5 mm 1st 43.49 ± 1.71 0.48 1.32 1.10 0.926 (0.894 to 0.949)
2nd 43.51 ± 1.65 0.43 1.18 0.98 0.936 (0.909 to 0.957)
Temporal 5 mm 1st 42.48 ± 1.40 0.30 0.83 0.70 0.956 (0.937 to 0.970)
2nd 42.47 ± 1.35 0.24 0.67 0.57 0.969 (0.955 to 0.979)
Inferior 5 mm 1st 43.47 ± 1.58 0.36 1.00 0.83 0.950 (0.928 to 0.966)
2nd 43.49 ± 1.60 0.36 1.00 0.83 0.951 (0.929 to 0.967)
  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