Table 2.

Comparison of pre- and post- operative astigmatism between subgroups

Subgroup	Preoperative astigmatism (in D)	Postoperative astigmatism (in D)	P
Axis Subgroup
Subgroup A (with-the-rule) (n=27)	1.25 (0.75, 2.00)	1.75 (1.25, 2.50)	<0.001
Subgroup B (plano) (n=18)	0.00 (0.00, 0.00)	0.75 (0.50, 1.00)	<0.001
Muscle Subgroup
Medial Rectus Subgroup (n=33)	1.00 (0.00, 1.75)	1.50 (0.75, 2.00)	<0.001
Lateral Rectus Subgroup (n=19)	0.50 (0.00, 1.38)	1.00 (0.63, 1.63)	0.002

D, diopters of astigmatism; Values are expressed as median (IQR, interquartile range). Changes between pre- and post- operative astigmatism were evaluated by nonparametric two-sided exact Wilcoxon signed-rank test. Bonferroni adjustment was used to correct for multiple comparisons (significant P<0.05/4=0.013)