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Comparisons of absolute errors in all eyes (n = 148). Absolute errors for the four intraocular lens (IOL) calculation formulas. The horizontal lines below and above the main box (whiskers) for each formula represent 2.5 and 97.5 percentile. The symbol + indicates mean absolute error, ∗∗ indicates P < 0.01, and ∗∗∗ indicates P < 0.001, as determined by a repeated-measures ANOVA test. D, diopters.
