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Table 1 Preliminary analysis of the preoperative corneal 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) 0.819 88 0.420 0.045
Group 2 (WTR) 0.827 138 0.376 0.032
Group 3 (OB) 0.677 62 0.387 0.049