Table 3.

Subgroup analysis of refractive prediction errors of the formulas compared by age.

	75–84	≥85	p-value
BUII
MedAE (D)	0.31	0.39	0.069
MAE ± SD (D)	0.36 ± 0.28	0.53 ± 0.45
% within ±0.25 D	32.61%	29.55%	0.754
% within ±0.50 D	78.26%	65.91%	0.191
% within ±1.00 D	97.83%	86.36%	0.056
Haigis
MedAE(D)	0.34	0.42	0.024
MAE ± SD (D)	0.38 ± 0.30	0.60 ± 0.46
% within ±0.25 D	41.30%	25.00%	0.101
% within ±0.50 D	76.09%	54.55%	0.032
% within ±1.00 D	95.65%	77.27%	0.010
Hoffer Q
MedAE(D)	0.31	0.49	0.053
MAE ± SD (D)	0.39 ± 0.32	0.60 ± 0.49
% within ±0.25 D	43.48%	31.82%	0.254
% within ±0.50 D	71.74%	50.00%	0.034
% within ±1.00 D	95.65%	84.09%	0.087
Holladay 1
MedAE(D)	0.30	0.45	0.026
MAE ± SD (D)	0.37 ± 0.30	0.58 ± 0.46
% within ±0.25 D	43.48%	22.73%	0.037
% within ±0.50 D	65.22%	52.27%	0.212
% within ±1.00 D	97.83%	81.82%	0.014
Kane
MedAE(D)	0.32	0.42	0.055
MAE ± SD (D)	0.37 ± 0.27	0.56 ± 0.47
% within ±0.25 D	45.65%	27.27%	0.070
% within ±0.50 D	82.61%	61.36%	0.024
% within ±1.00 D	95.65%	84.09%	0.087
SRK/T
MedAE(D)	0.28	0.46	0.058
MAE ± SD (D)	0.38 ± 0.31	0.57 ± 0.48
% within ±0.25 D	43.48%	20.45%	0.019
% within ±0.50 D	65.22%	56.82%	0.414
% within ±1.00 D	95.65%	81.82%	0.047

BUII = Barrett Universal II, MedAE = median absolute prediction error, MAE = mean absolute prediction error.