Table 7.

Descriptive analysis of the studied eyes according to I-Trace between 3 months and 1 year

I–Trace	Post operation 3 months	Post operation 1 year	p
Defocus (μ)
Positive
Min. – Max.	0.06–0.53	0.02–0.36	Zp = 0.310
Mean ± SD.	0.20 ± 0.16	0.15 ± 0.15
Median	0.16	0.07
Negative
Min. – Max.	−0.91 – 0.0	− 0.10 – –0.01	Zp = 0.144
Mean ± SD.	− 0.38 ± 0.39	−0.05 ± 0.04
Median	−0.30	− 0.05
Astig (μ @)
Min. – Max.	0.05–0.57	0.03–0.62	Zp = 0.256
Mean ± SD.	0.21 ± 0.15	0.24 ± 0.19
Median	0.16	0.17
HO Total (μ)
Min. – Max.	0.06–0.32	0.06–0.50	Zp = 1.000
Mean ± SD.	0.16 ± 0.08	0.16 ± 0.11
Median	0.16	0.13
Coma (μ @)
Min. – Max.	0.02–0.18	0.01–0.20	Zp = 0.875
Mean ± SD.	0.07 ± 0.05	0.07 ± 0.05
Median	0.05	0.07
Spherical (μ)
Positive
Min. – Max.			–
Mean ± SD.	0.12	0.03
Median
Negative
Min. – Max.	−0.05 – 0.0	−0.07 – 0.0	Zp = 0.893
Mean ± SD.	− 0.03 ± 0.02	−0.03 ± 0.03
Median	−0.03	− 0.02
2ry Astig (μ @)
Min. – Max.	0.0–0.12	0.0–0.15	Zp = 0.977
Mean ± SD.	0.03 ± 0.03	0.04 ± 0.04
Median	0.02	0.02
Trefoil (μ @)
Min. – Max.	0.01–0.20	0.02–0.34	Zp = 0.426
Mean ± SD.	0.08 ± 0.06	0.10 ± 0.09
Median	0.05	0.08
RMS (mm)
Min. – Max.	2.0–3.70	2.0–4.0	tp = 0.832
Mean ± SD.	2.73 ± 0.52	2.77 ± 0.58
Median	2.60	2.60

t: Paired t-test Z: Wilcoxon signed ranks test

p: p value for comparing between pre-operation and final