slightly significantP = 0.03
The mean differences between the achieved vault and predicted vault of the horizontal-placement eyes in groups A, B, C and D were 23.14 ± 233.20 μm, -46.39 ± 189.22 μm, 9.45 ± 187.43 μm, and − 76.72 ± 165.68 μm, respectively, and the prediction errors of the other three groups were not statistically significant ( P = 0.268, 0.649, 0.156) except for group B, which showed a slightly significant difference ( P = 0.03).