Table 3 Definition and description of sacrum indices adopted from Kanika et al. (2011) and Shreekrishna et al. (2013)
From: Stature estimation of the Malaysian population based on sacrum CT scans
No. | Index(es) | Description | Formula |
|---|---|---|---|
I1 | Sacral index | Ratio of sacral basal width to sacral height (sacral mid-ventral straight length) (%) | P1 ÷ P6 |
I2 | Corporobasal index | Ratio of transverse diameter of S1 body (corpus width) to sacral basal width of S1 (%) | P2 ÷ P1 |
I3 | S1 body index | Ratio of anteroposterior (A-P) diameter to transverse diameter of S1 body (%) | P3 ÷ P2 |
I4 | Alar base-wing index | Ratio of average bilateral ala width to transverse diameter of S1 body (%) | (P4 + P5) ÷ 2 ÷ P2 |
I5 | Auricular index | Ratio of average bilateral auricular surface length to sacral basal width (%) | (P7 + P8) ÷ 2÷ P1 |
I6 | Alar diagonal index | Ratio of average bilateral ala width to average bilateral ala anteroposterior (A-P) length (%) | ((P4 + P5) ÷ 2) ÷ ((P9 + P10) ÷ 2) |