Table 3. Differences of 12-month postoperative minus preoperative measurements.
| Parameter | Mean ± SD [Range] | P-value | |
|---|---|---|---|
| LASIK (n = 52) | SMILE (n = 52) | ||
| Δ Corneal volume (mm³) | |||
| 3-mm diameter region | -0.42 ± 0.22 | 0.49 ± 0.14 | .053 |
| [-1.0 to 0.0] | [-0.7 to -0.1] | ||
| 5-mm diameter region | -0.99 ± 0.52 | -1.17 ± 0.34 | .023 |
| [-2.5 to 0.1] | [-1.7 to -0.2] | ||
| 7-mm diameter region | -1.41 ± 0.85 | -1.69 ± 0.55 | .020 |
| [-4.0 to 0.7] | [-2.9 to -0.2] | ||
| 10-mm diameter region | -1.39 ± 1.32 | -1.62 ± 1.10 | .333 |
| [-5.2 to 2.7] | [-5.2 to 0.7] | ||
| Δ Corneal thickness (μm) | |||
| Apex | -64.00 ± 32.65 | -75.62 ± 20.33 | .013 |
| [-154 to -5] | [-108 to -18] | ||
| 2-mm diameter region | -59.59 ± 30.15 | -69.37 ± 18.96 | .024 |
| [-140 to -3] | [-99 to -15] | ||
| 4-mm diameter region | -43.98 ± 24.12 | -52.60 ± 15.58 | .024 |
| [-112 to 10] | [-81 to -8] | ||
| 6-mm diameter region | -18.61 ± 15.21 | -23.79 ± 11.48 | .022 |
| [-66 to 28] | [-54 to 4] | ||
| 8-mm diameter region | -0.65 ± 11.82 | -2.33 ± 12.43 | .639 |
| [-27 to 38] | [-34 to 20] | ||
LASIK = laser-assisted in situ keratomileusis; SD = standard deviation; SMILE = small-incision lenticule extraction; Δ = 12-month postoperative minus preoperative.