Table 3.

Absolute prediction errors for subgroup analysis for each formula

Formula	Barrett Universal II	EVO	Hill-RBF
1. Short eyes
MAE	0.359	0.345	0.353
MedAE	0.298	0.252	0.300
Eyes within PE (%)
±0.25	42.67	49.33	42.67
±0.50	78.67	74.67	80.00
±0.75	92.00	92.00	93.33
2. Medium eyes
MAE	0.271	0.286	0.302
MedAE	0.232	0.208	0.218
Eyes within PE (%)
±0.25	59.09	54.55	54.55
±0.50	89.39	86.36	84.85
±0.75	98.48	96.97	96.97
3. Long eyes
MAE	0.274	0.315	0.306
MedAE	0.222	0.282	0.280
Eyes within PE (%)
±0.25	55.38	43.08	46.15
±0.50	89.23	78.46	90.77
±0.75	95.38	95.38	93.85

MAE=Mean absolute prediction error, MedAE=Median absolute prediction error, PE=Prediction error