. 2021 May 4;16(5):e0250700. doi: 10.1371/journal.pone.0250700

Table 1. Study population characteristics (n = 104).

Parameter	Mean ± SD [Range]		P-value
	LASIK	SMILE
Number of patients/ eyes	26 / 52	26 / 52
Gender: female/ male (%)	44.23 / 55.77	50.00 / 50.00
Age (y)	36.15 ± 9.29	34.27 ± 7.22
Age (y)	[21 to 58]	[24 to 50]
Eye used: right/ left (%)	50.00 / 50.00	51.92 / 48.08
Sphere (D)	-3.32 ± 1.87	-3.85 ± 1.33
Sphere (D)	[-7-75 to 0.00]	[-6.50 to -1.00]
Cylinder (D)	-0.96 ± 1.08	-0.87 ± 0.61	.460
Cylinder (D)	[-4.50 to 0.00]	[-2.25 to 0.00]	.460
SE (D)	-3.96 ± 1.67	-4.06 ± 1.50	.449
SE (D)	[-8.00 to -1.75]	[-7.00 to -1.13]	.449
Corneal volume (mm³)
3-mm diameter region	4.02 ± 0.18	4.02 ± 0.22	.684
3-mm diameter region	[3.7 to 4.4]	[3.7 to 4.5]	.684
5-mm diameter region	11.76 ± 0.52	11.77 ± 0.62	.897
5-mm diameter region	[10.9 to 12.8]	[10.8 to 13.2]	.897
7-mm diameter region	25.19 ± 1.11	25.32 ± 1.30	.680
7-mm diameter region	[23.3 to 27.6]	[23.1 to 28.0]	.680
10-mm diameter region	61.36 ± 2.82	62.59 ± 3.43	.114
10-mm diameter region	[55.7 to 67.5]	[56.2 to 69.7]	.114
Corneal thickness (μm)
Apex	557.57 ± 24.54	556.75 ± 30.97	.746
Apex	[516 to 604]	[512 to 631]	.746
2-mm diameter region	562.75 ± 24.42	562.52 ± 31.11	.779
2-mm diameter region	[520 to 609]	[518 to 636]	.779
4-mm diameter region	589.35 ± 25.26	590.21 ± 31.21	.911
4-mm diameter region	[548 to 641]	[542 to 662]	.911
6-mm diameter region	636.55 ± 27.60	639.33 ± 31.69	.721
6-mm diameter region	[593 to 692]	[583 to 706]	.721
8-mm diameter region	708.51 ± 31.38	717.17 ± 34.82	.212
8-mm diameter region	[653 to 773]	[645 to 783]	.212

LASIK = laser-assisted in situ keratomileusis; SD = standard deviation; SE = spherical equivalent; SMILE = small-incision lenticule extraction; y = years, D = diopter.