Table 2.

Absolute error (D) for each formula.

Formula	Median absolute error†	95% CI	Range	P value‡
Haigis	1.025	1.297–1.816	0.01–5.92	/
Hoffer Q	1.635	1.925–2.042	0.04–7.37	<0.001∗∗∗
Holladay 1	1.435	1.610–2.149	0.04–6.87	<0.001∗∗∗
SRK/T	1.040	1.479–2.042	0.04–6.61	0.002∗∗

^†Absolute error = actual postoperative spherical equivalent − predicted spherical equivalent.

^‡Compared with results achieved using the Haigis formula (repeated-measures ANOVA).

D, diopters; CI, confidence interval.

∗∗ indicates P < 0.01; ∗∗∗ indicates P < 0.001.