Correlations between optic disc variables and age (x) and inferior quadrant integral of RNFL thickness (y) in 38 normal subjects
| Variable | Equation | p Value | R | R2 |
| Age | y = −6.23E−04x + 0.194 | 0.076 | −0.291 | 0.085 |
| Disc area | y = 0.037x + 0.078 | 0.003 | 0.468 | 0.219 |
| Average depth | y = −0.017x + 0.169 | 0.829 | −0.057 | 0.003 |
| C/D ratio | y = −0.024x + 0.173 | 0.420 | −0.135 | 0.018 |
| Contour modulation | y = 0.181x + 0.146 | 0.367 | 0.234 | 0.055 |
| Contour variation | y = 0.099x + 0.130 | 0.369 | 0.233 | 0.054 |
| ½ depth area | y = 0.031x + 0.165 | 0.505 | 0.174 | 0.030 |
| ½ depth volume | y = 0.013x + 0.173 | 0.954 | 0.015 | 0.000 |
| Effective area | y = 0.003x + 0.162 | 0.816 | 0.039 | 0.002 |
| Maximum depth | y = 0.009x + 0.169 | 0.734 | 0.057 | 0.003 |
| Mean contour depth | y = 0.033x + 0.162 | 0.422 | 0.134 | 0.018 |
| NRA | y = 0.029x + 0.121 | 0.015 | 0.393 | 0.154 |
| Volume above | y = 0.056x + 0.146 | 0.090 | 0.279 | 0.078 |
| Volume below | y = −0.012x + 0.162 | 0.717 | −0.061 | 0.004 |