. 2021 Jul 24;21:286. doi: 10.1186/s12886-021-02042-x

Table 3.

Mean changes in corneal curvature parameters over 12-month follow-up (n = 31, x ± s)

	Preoperative	1-month	6-month	12-month	F	P
K_apex(D) K1(D) K2(D) mean K(D) CYL(D)	57.23 ± 5.09 45.47 ± 2.35 48.35 ± 2.94 46.86 ± 2.53 -2.87 ± 1.54	54.96 ± 4.44* 45.64 ± 2.71 48.73 ± 3.47 47.12 ± 2.97 -3.09 ± 1.74	54.24 ± 4.87* 45.31 ± 2.83^# 48.23 ± 3.26^# 46.69 ± 2.98^# -2.91 ± 1.61	53.13 ± 4.47*^#& 45.28 ± 2.77^# 48.09 ± 3.04^# 46.63 ± 2.79^# -2.79 ± 1.60	29.453 1.794 4.077 3.775 1.707	< 0.001 0.171 0.016 0.022 0.188

Preoperative

1-month

6-month

12-month

K_apex(D)

K1(D)

K2(D)

mean K(D)

CYL(D)

57.23 ± 5.09

45.47 ± 2.35

48.35 ± 2.94

46.86 ± 2.53

-2.87 ± 1.54

54.96 ± 4.44*

45.64 ± 2.71

48.73 ± 3.47

47.12 ± 2.97

-3.09 ± 1.74

54.24 ± 4.87*

45.31 ± 2.83^#

48.23 ± 3.26^#

46.69 ± 2.98^#

-2.91 ± 1.61

53.13 ± 4.47*^#&

45.28 ± 2.77^#

48.09 ± 3.04^#

46.63 ± 2.79^#

-2.79 ± 1.60

29.453

1.794

4.077

3.775

1.707

< 0.001

0.171

0.016

0.022

0.188

Abbreviations: K_apex maximal keratometry value of the front surface; K flat-axis keratometric value; K2 steep-axis keratometric value; Mean K mean keratometric value; CYL corneal cylinder

* significant difference compared with preoperative baseline (P < 0.05)

^# significant difference compared with postoperative 1-month (P < 0.05)

^& significant difference compared with postoperative 6-month (P < 0.05)