Correlations between optic disc variables and age (x) and superior quadrant integral of RNFL thickness (y) in 38 normal subjects
| Variable | Equation | p Value | R | R2 |
| Age | y = −7.3E−04x + 0.206 | 0.088 | −0.280 | 0.079 |
| Disc area | y = 0.035x + 0.091 | 0.026 | 0.361 | 0.130 |
| Average depth | y = −0.135x + 0.147 | 0.129 | −0.384 | 0.147 |
| C/D ratio | y = −0.030x + 0.182 | 0.412 | −0.137 | 0.019 |
| Contour modulation | y = 0.196x + 0.146 | 0.395 | 0.221 | 0.049 |
| Contour variation | y = −0.003x + 0.176 | 0.981 | −0.006 | 0.000 |
| ½ depth area | y = 0.095x + 0.151 | 0.064 | 0.459 | 0.211 |
| ½ depth volume | y = −0.197x + 0.167 | 0.427 | −0.206 | 0.043 |
| Effective area | y = 9.2E−04x + 0.172 | 0.993 | −0.001 | 0.000 |
| Maximum depth | y = 0.032x + 0.189 | 0.320 | 0.166 | 0.028 |
| Mean contour depth | y = 0.035x + 0.170 | 0.482 | 0.118 | 0.014 |
| NRA | y = 0.031x + 0.126 | 0.037 | 0.339 | 0.115 |
| Volume above | y = 0.049x + 0.156 | 0.228 | 0.200 | 0.040 |
| Volume below | y = −0.005x + 0.171 | 0.901 | −0.021 | 0.000 |