Table 1. Demographic characteristics of participants in normal, SKCN, and KCN groups.
| Eyes (n) | Normal (n=68) | SKCN (n=79) | KCN (n=70) | Total (n=217) | P1 | P2 |
| Age (y) | 30.7±7.01 (19-49) | 30.15±5.42 (17-42) | 32.5±6.07 (18-47) | 31.08±6.21 (17-49) | 1.000 | 0.267 |
| Sphere (D) | -2.30±2.17 (-6.00 to +8.00) | -1.69±2.04 (-8.75 to +2.5) | -2.33±3.01 (-13.5 to +3.75) | -2.09±2.47 (-13.5 to +8.00) | 0.406 | 1.000 |
| Cylinder (D) | -1.63±1.58 (0.0 to -7.25) | -1.44±1.17 (0 to -5.00) | -3.34±1.88 (-0.50 to -10.75) | -2.11±1.76 (0 to -10.75) | 1.000 | <0.001 |
| SE (D) | -1.48±2.48 (-5.50 to +8.88) | -0.96±2.12 (-8.25 to +2.75) | -0.65±3.05 (-11.50 to +6.38) | -1.03±2.57 (-11.50 to +8.88) | 0.673 | 0.183 |
| BCVA, logMAR | 0.01±0.04 (0 to +0.2) | 0.03±0.02 (0 to +0.3) | 0.32±0.21 (0.1 to +0.8) | 0.11±0.19 (0 to +0.8) | 1.000 | <0.001 |
D: Diopters; SE: Spherical equivalent; BCVA: Best-corrected visual acuity; logMAR: Logarithm of the minimum angle of resolution; SKCN: Subclinical keratoconus; KCN: Keratoconus. 1The comparison between normal and SKCN eyes; 2The comparison between normal and KCN eyes (ANOVA/Bonferroni).
mean±SD (range)