Factors associated with the presence of gamma zone, by comparing the group with gamma zone and the group without gamma zone, in univariate and multivariate analysis
| Gamma zone | Without gamma zone | Univariable analysis | Multivariable analysis | |||
| (n=180) | (n=498) | P value | OR (95% CI) | P value | OR (95% CI) | |
| Age (years) | 61.2±7.8 | 58.9±7.4 | <0.001 | 1.04 (1.02 to 1.06) | 0.67 | 0.99 (0.96 to 1.03) |
| Gender (male/%) | 99/55.0 | 179/35.9 | <0.001 | 2.18 (1.54 to 3.08) | 0.11 | 1.42 (0.92 to 2.20) |
| IOP (mm Hg) | 14.9±2.8 | 14.5±2.5 | 0.08 | 1.06 (0.99 to 1.13) | / | |
| Axial length (mm) | 24.5±1.5 | 23.2±0.9 | <0.001 | 2.51 (2.11 to 3.0) | <0.001 | 2.33 (1.91 to 2.83) |
| BMO area (mm2) | 2.5±0.6 | 2.2±0.4 | <0.001 | 4.52 (2.98 to 6.87) | <0.001 | 3.52 (2.11 to 5.88) |
| PCT (μm) | 123±37 | 138±40 | <0.001 | 0.99 (0.98 to 0.995) | 0.10 | 0.99 (0.99 to 1.00) |
| LC depth (μm) | 446±99 | 450±101 | 0.66 | 0.99 (0.99 to 1.001) | 0.07 | 1.00 (1.00 to 1.01) |
| PPSA (°) | 7.6±6.8 | 3.8±4.4 | <0.001 | 1.14 (1.10 to 1.18) | 0.006 | 1.06 (1.02 to 1.11) |
All variables included in the multivariable model with their VIF less than 1.53.
BMO, Bruch’s membrane opening; IOP, intraocular pressure; LC, lamina cribrosa; PCT, peripapillary choroidal thickness; PPSA, peripapillary scleral angle; VIF, variance inflation factor.