Table 4

- Distribution of optic nerve head (ONH) values according to age group.

ONH parameter	Mean (SD)	4–7 years					8–12 years				13–18 years
		Mean (SD)	Percentile			Mean (SD)	Percentile			Mean (SD)	Percentile			P-value
		Mean (SD)	25	50	75	Mean (SD)	25	50	75	Mean (SD)	25	50	75	P-value
Rim area, mm²	1.6 (0.3)	1.6 (0.3)^A	1.5	1.6	1.7	1.6 (0.3)^A	1.4	1.6	1.8	1.4 ± 0.2B	1.3	1.4	1.6	0.006^{^a,^b}
Disc area, mm²	2 (0.4)	2.1 (0.5)^A	1.8	2.0	2.2	2 (0.4)^AB	1.6	1.9	2.2	1.8 ± 0.3B	1.6	1.8	2.0	0.034^{^a,^b}
Cup volume, mm³	0.3 (1.1)	0.1 (0.2)	0.0	0.1	0.2	0.1 (0.1)	0.0	0.1	0.2	0.5 ± 1.9	0.1	0.1	0.3	0.309
Mean C/D ratio	0.4 (0.2)	0.4 (0.2)	0.3	0.4	0.5	0.4 (0.2)	0.2	0.4	0.5	0.4 ± 0.2	0.3	0.4	0.6	0.150
Vertical C/D ratio	0.4 (0.2)	0.4 (0.2)	0.3	0.4	0.5	0.3 (0.2)	0.2	0.3	0.5	0.4 ± 0.2	0.3	0.4	0.6	0.356

↵^a *Capital letters indicate post hoc multiple pairing summary indicator. The presence of the same letter indicates the same measure statistically. Significant using one-way ANOVA at <0.05 level.
↵^b Post hoc test: LSD.