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Table 2 Preliminary analysis of the preoperative corneal astigmatism orientation groups. (non-average axial length eyes, i.e., eyes with an axial length less than or equal to 22.0 mm or greater than or equal to 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) 0.836 20 0.539 0.121
Group 2 (WTR) 0.839 21 0.452 0.098
Group 3 (OB) 0.768 10 0.483 0.153