. 2017 Jun 13;29(3):199–203. doi: 10.1016/j.joco.2017.05.007

Table 2.

Comparison of overall mean absolute error (MAE) between axial length and refractive vergence intraocular lens (IOL) power formulas.

Vergence	PE ± SD	MedAE range	P-value^b	MAE ± SD	Standard error^a	P-value^a	95% Confidence interval^a
Vergence	PE ± SD	MedAE range	P-value^b	MAE ± SD	Standard error^a	P-value^a	Lower limit	Upper limit
Axial length (D)	−0.38 ± 2.01	1.19 0.31 to 4.05	–	1.64 ± 1.20	0.22	–	1.25	2.04
Refractive (D)	−2.89 ± 3.40	2.48 0.68 to 9.89	–	3.59 ± 2.70	0.49	–	2.62	4.67
Difference (D)	2.52 ± 3.70	1.01 −1.74 to 9.33	<0.001	1.95 ± 2.93	0.52	0.010	0.98	3.04

MAE: Mean absolute error; MedAE: Median absolute error; D: Diopter; a: Bootstrap output; SD: Standard deviation; b: P-value from Wilcoxon signed rank test; PE: Prediction error.

P-value less than 0.05 was statistically significant.