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Table 6 Analysis of the postoperative SE prediction error according to the preoperative astigmatism orientation groups. (average axial length eyes, i.e., eyes with axial lengths greater than 22.0 mm and less than 25.0 mm)

From: Investigating the impact of preoperative corneal astigmatism orientation on the postoperative spherical equivalent refraction following intraocular lens implantation

Descriptive statistics
  Mean (M) Sample size (N) Std. deviation (SD) Std. error mean (SEM)
Group 1 (ATR) −0.132 88 0.475 0.051
Group 2 (WTR) 0.026 138 0.497 0.042
Group 3 (OB) −0.130 62 0.479 0.0609