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Br J Ophthalmol 81:1046-1049 doi:10.1136/bjo.81.12.1046
  • Original Article
    • Clinical science

Effect of optic disc size or age on evaluation of optic disc variables

Table 4

Effect of age on optic disc variables

Variable Equation p Value R
Contour variation y = 0.265+0.002x 0.134 0.173
Mean contour depth y = −0.112+0.002x 0.220 0.141
Cup shape y = −0.079+0.001x 0.405 0.095
Effective area y = 1.296−0.005x 0.413 −0.095
1/2 depth area y = 0.688−0.005x 0.131 −0.173
C/D ratio† y = 0.536−0.002x 0.332 −0.114
NRRA‡ y = 0.988+0.009x 0.150 0.167
Volume above y = 0.152+0.001x 0.399 0.118
Volume below y = −0.397+0.002x 0.342 0.109
1/2 depth volume y = −0.100+0.001x 0.154 0.164
Average depth y = −0.265+0.001x 0.627 0.055
Maximum depth y = −0.231−0.006x 0.076 −0.205
Average slope y = 30.113+0.034x 0.739 0.045
Maximum slope y = 72.987+0.097x 0.191 0.152

  • ↵R = correlation coefficient; †C/D = cup/disc; ‡NRRA = neuroretinal rim area.

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