. 2017 Jan 25;31(1):11–18. doi: 10.1016/j.sjopt.2017.01.002

Table 2.

The mean corneal astigmatism and its P values.

Corneal astigmatism	Preoperative Mean ± SD Min-max	3 months Mean ± SD Min-max	P¹ value	6 months Mean ± SD Min-max	P² value	12 months Mean ± SD Min-max	P³ value
	2.4 ± 1.01	2.6 ± 1.00^AC	<0.001^*	2.17 ± 0.8^AB	<0.001^*	2.01 ± 0.8^BC	<0.001^*
	1.10–5.4	1.3–5.6	<0.001^*	1.1–4.9	<0.001^*	0.9–4.4	<0.001^*

Paired samples t test. ABC: Similar letters indicate statistically significant differences (p < 0.05).

P1: difference between preoperative and after 3 months.

P2: difference between preoperative and 6 months.

P3: difference between preoperative and 12 months.

SD: Standard deviation.