Table 3.

Comparison of post-operative residual astigmatism prediction error at 2 diameter zones and subgroup analyses.

Parameter(D)	2.4 mm	3.3 mm	P value
Total (n = 101)
Mean ± SD	0.51 ± 0.46	0.46 ± 0.36	p = 0.799
Centroid ± SD	0.09 ± 0.68 @87	0.09 ± 0.58 @25	p = 0.003*(x-axis); 0.123 (y-axis)
WTR (n = 47)
Mean ± SD	0.34 ± 0.24	0.38 ± 0.26	p = 0.250
Centroid ± SD	0.07 ± 0.42 @ 8	0.12 ± 0.45 @ 19	p = 0.485 (x-axis); 0.031* (y-axis)
ATR (n = 33)
Mean ± SD	0.62 ± 0.50	0.53 ± 0.48	p = 0.413
Centroid ± SD	0.32 ± 0.74 @88	0.07 ± 0.72 @ 52	p = 0.024* (x-axis); 0.479(y-axis)
Oblique (n = 21)
Mean ± SD	0.70 ± 0.65	0.52 ± 0.32	p = 0.934
Centroid ± SD	0.09 ± 0.96 @101	0.09 ± 0.61 @15	p = 0.002* (x-axis); 0.573(y-axis)