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Table 3: Two by 2 group comparisons of the optic nerve diameter measurements on different scans
<6 mo 6 mo–2 yr 2–6 yr 6–12 yr
6 mo–2 yr 
    Axial 
        RB .196 – – –
        MA .225 – – –
    Coronal 
        RB .026^{^a} – – –
        MA .453 – – –
2–6 yr 
    Axial 
        RB <.001^{^a} .035^{^a} – –
        MA .010^{^a} .626 – –
    Coronal 
        RB <.001^{^a} .499 – –
        MA <.001^{^a} .049^{^a} – –
6–12 yr 
    Axial 
        RB <.001^{^a} .003^{^a} .999 –
        MA <.001^{^a} <.001^{^a} .001^{^a} –
    Coronal 
        RB <.001^{^a} .032^{^a} .870 –
        MA <.001^{^a} .007^{^a} .999 –
12–18 yr 
    Axial 
        RB <.001^{^a} <.001^{^a} .085 .445
        MA <.001^{^a} <.001^{^a} .002^{^a} .999
    Coronal 
        RB <.001^{^a} .094 .999 .999
        MA <.001^{^a} <.001^{^a} .127 .324
Note:—RB indicates retrobulbar; MA, midaspect.
↵a P value significant at .05.

	<6 mo	6 mo–2 yr	2–6 yr	6–12 yr
6 mo–2 yr
Axial
RB	.196	–	–	–
MA	.225	–	–	–
Coronal
RB	.026^{^a}	–	–	–
MA	.453	–	–	–
2–6 yr
Axial
RB	<.001^{^a}	.035^{^a}	–	–
MA	.010^{^a}	.626	–	–
Coronal
RB	<.001^{^a}	.499	–	–
MA	<.001^{^a}	.049^{^a}	–	–
6–12 yr
Axial
RB	<.001^{^a}	.003^{^a}	.999	–
MA	<.001^{^a}	<.001^{^a}	.001^{^a}	–
Coronal
RB	<.001^{^a}	.032^{^a}	.870	–
MA	<.001^{^a}	.007^{^a}	.999	–
12–18 yr
Axial
RB	<.001^{^a}	<.001^{^a}	.085	.445
MA	<.001^{^a}	<.001^{^a}	.002^{^a}	.999
Coronal
RB	<.001^{^a}	.094	.999	.999
MA	<.001^{^a}	<.001^{^a}	.127	.324