Table 2.

Comparison of keratometry readings and symmetry indices between the two groups

		Group 1 (n = 37)	Group 2 (n = 29)	P
K1 (D)	Preop	45.64 ± 2.8	45.88 ± 2.3	0.708
	12-month postop	45.71 ± 2.91	45.30 ± 3.02	0.580
	Mean change	−0.07 ± 0.72	0.58 ± 2.03	0.001
	P*	0.559	0.135
K2 (D)	Preop	49.10 ± 3.56	49.39 ± 3.06	0.727
	12-month postop	49.19 ± 3.63	48.47 ± 3.27	0.408
	Mean change	−0.09 ± 0.79	0.92 ± 1.22	0.0001
	P*	0.506	0.0001
AvgK (D)	Preop	47.3 ± 3.09	47.56 ± 2.56	0.715
	12-month postop	47.37 ± 3.15	46.63 ± 2.76	0.322
	Mean change	−0.08 ± 0.69	0.93 ± 1.14	0.0001
	P*	0.513	0.0001
AKf (D)	Preop	56.38 ± 5.26	56.29 ± 5.34	0.949
	12-month postop	55.59 ± 4.98	54.44 ± 5.12	0.364
	Mean change	0.79 ± 1.59	1.85 ± 1.58	0.003
	P*	0.005	0.001
AKb (D)	Preop	80.9 ± 10.76	80.95 ± 12.09	0.985
	12-month postop	84.61 ± 11.94	85.9 ± 12.64	0.672
	Mean change	−3.71 ± 6.06	−4.95 ± 4.35	0.108
	P*	0.001	0.0001
SIf (D)	Preop	6.48 ± 3.74	6.6 ± 3.63	0.900
	12-month postop	6.14 ± 3.57	5.72 ± 3.44	0.631
	Mean Change	0.34 ± 0.93	0.88 ± 0.83	0.008
	P*	0.031	0.0001
SIb (D)	preop	1.67 ± 0.84	1.63 ± 0.82	0.845
	12-month postop	1.75 ± 0.79	1.7 ± 0.85	0.796
	Mean change	−0.08 ± 0.26	−0.06 ± 0.29	0.999
	P*	0.091	0.254

K1 = flat keratometry; K2 = steep keratometry; AvgK = average keratometry; AKf = apical keratoscopy front (Kmax); AKb = apical keratoscopy back; SIf = symmetry index front; SIb = symmetry index back; D = Diopters

P: Paired t test; P*: Student’s t-test; Values in bold are significant (P < 0.05)