Various mean net astigmatisms of preoperative and postoperative cornea.

Bivariate significance tests for differences between preoperative and postoperative astigmatisms of each subject were performed on 0 diopter @ 0° using Hotelling’s T2.针对每位受试者术前与术后散光的差异，采用霍特林T²检验（Hotelling’s T2）在0屈光度@0°条件下开展双变量显著性检验。