Table 2. Demographic data and preoperative characteristics of the study participants.

Characteristics	SMILE group (n = 38)	femto-LASIK group (n = 33)	P value
Age (mean±SD, years)	28.21±7.04	27.33±6.58	0.59*
Male/Female	10/28	6/27	0.41†
Preoperative SE (D)
Mean	−6.68±1.34	−7.96±2.61	0.009*
Range	−9.00 to −4.25	−12.50 to −2.00
Treated SE (D)
Mean	−7.15±1.49	−8.55±2.84	0.008*
Range	−9.75 to −4.00	−13.38 to−2.50
Corneal thickness (µm)	544.74±30.27	538.52±27.69	0.44*
Ablation depth (mean±SD, µm)	131.46±22.96	133.24±30.45	0.45*
Range	77 to 165	51 to 168
CDVA (logMAR)	−0.02±0.05	−0.00±0.07	0.33*

SMILE: small incision lenticule extraction. femto-LASIK: femtosecond LASIK.

SD: standard deviation. SE: spherical equivalent. D: diopter. CDVA: corrected distance visual acuity.

^*independent Student’s t-test or Mann Whitney U test.

^†chi-square test.