Table 1.

Mean ± standard deviation (SD), range, 95% confidence interval for mean, first, fifth, fiftieth and ninety fifth percentiles of various optic nerve head (ONH) parameters

ONH parameters	Mean ± SD	Range	95% confidence interval for mean	1st percentile	5th percentile	50th percentile	95th percentile
Disc area (mm2)	3.36 ± 0.64	2.13 – 5.08	3.27 – 3.69	2.14	2.42	3.37	4.85
Cup area (mm2)	1.1 ± 0.75	0.0 – 3.07	0.98 – 1.22	0.0	0.0	1.63	3.82
Rim area (mm2)	2.49 ± 0.58	1.20 – 3.62	2.4 – 2.58	0.58	0.82	1.65	2.74
Cup/disc horizontal ratio	0.5 ± 0.23	0.0 – 0.88	0.46 – 0.53	0.0	0.0	0.81	0.9
Cup/disc vertical ratio	0.5 ± 0.21	0.0 – 0.81	0.47 – 0.54	0.0	0.0	0.71	0.88
Cup/disc area ratio	0.29 ± 0.18	0.0 – 0.68	0.26 – 0.32	0.0	0.0	0.51	0.81
Mean cup depth (mm)	0.18 ± 0.11	0.0 – 0.53	0.16 – 0.19	0.0	0.0	0.14	0.3
Maximum cup depth (mm)	0.36 ± 0.21	0.0 – 0.98	0.33 – 0.4	0.0	0.0	0.37	0.64