Table 3.

Arithmetic RPE, Absolute RPE and Median Absolute Error

	Eyes	Arithmetic RPE		Absolute RPE
Calculation/formula	n	Mean ± SD	Min to max (range)	Mean ± SD (range)	MedAE** (range)
Anterion-OKULIX	25	−0.13 ± 0.30	−0.7 to 0.41 (1.11)	0.26 ± 0.19 (0.64)	0.21 (0.57)
Casia-OKULIX	37	0.29 ± 0.36*	−0.44 to1.31 (1.75)	0.35 ± 0.30 (1.31)	0.23 (1.00)
Barret TK NH	37	−0.32 ± 0.27*	−0.87 to 0.40 (1.27)	0.35 ± 0.24 (0.87)	0.16 (0.72)
Haigis-L	37	−0.40 ± 0.34*	−1.08 to 0.55 (1.63)	0.45 ± 0.26* (1.05)	0.18 (0.95)

Notes: *Mixed models estimates statistically significantly different from Anterion-OKULIX (Holm-Bonferroni adjusted p-values); **arithmetic mean error reduced to zero.

Abbreviations: MedAE, median absolute error; Barret TK NH, Barret true K no history.