Table 4.

Polar value analysis of Sim-K_Ant..

Group	Mean Keratometry (D) ± SD						P Valuea	P Valueb
	Preoperative		Postoperative		Change
	AKP(+0)	AKP(+45)	AKP(+0)	AKP(+45)	△AKP(+0)	△AKP(+45)		△AKP(+0)	△AKP(+45)
Temporal	0.76 ± 0.41	0	−0.04 ± 0.47	−0.03 ± 0.57	−0.80 ± 0.61	−0.03 ± 0.57	<0.001	<0.001	0.698
Superotemporal	0.94 ± 0.83	0	0.04 ± 0.59	0.10 ± 0.83	−0.90 ± 1.05	0.10 ± 0.83	<0.001	<0.001	0.382
Superonasal	0.81 ± 0.48	0	0.05 ± 0.63	0.03 ± 0.66	−0.76 ± 0.79	0.03 ± 0.66	<0.001	<0.001	0.697
Superior	1.10 ± 0.62	0	−0.01 ± 0.95	−0.13 ± 0.69	−1.11 ± 1.08	−0.13 ± 0.69	<0.001	<0.001	0.159

D = diopters; SD = standard deviation; △ = change; AKP = astigmatic polar value.

^aHotelling trace between preoperative and postoperative keratometry.

^bUnivariate analysis for △AKP(+0) and △AKP(+45).