Demographics and normative distancesa

Demographics/Distances
Age (yr)56 ± 15.5
Sex (F/M)20:22
OC
    Upperb18.3 ± 2.9
    Mid17.8 ± 3.0
    Lower17.0 ± 2.9
PC-SL
    Upper4.3 ± 1.5
    Mid4.1 ± 1.2
    Lower3.7 ± 1.0
PC-PD
    Upper3.7 ± 1.4
    Mid4.4 ± 1.6
    Lower3.4 ± 1.2
FP distance to cord0.2 ± 0.5
PC-SL in subjects with anterior FP
    Upper3.8 ± 1.9
    Mid3.6 ± 1.6
    Lower3.3 ± 1.3
PC-PD in subjects with anterior FP
    Upper3.2 ± 1.7
    Mid3.7 ± 1.7
    Lower2.9 ± 1.3

  • Note:—OC indicates osseous canal.

  • ↵a Data are means and all measurements are in millimeters, unless otherwise stated.

  • ↵b Refers to the position in the C1–2 interspace.