Skip to main content

Table 3 Definition and description of sacrum indexes adopted from Kanika et al. (2011) and Shreekrishna et al. (2013)

From: Stature estimation study based on pelvic and sacral morphometric among Malaysian population

No Index(es) Description Formula
I1S Sacral index Ratio of sacral basal width to sacral height (sacral mid-ventral straight length) (%) \(\frac{{\text{P1}}}{{\text{P5}}}\)
I2S Corporobasal index Ratio of transverse diameter of S1 body (corpus width) to sacral basal width of S1 (%) \(\frac{{\text{P2}}}{{\text{P1}}}\)
I3S S1 body index Ratio of anteroposterior (A-P) diameter to transverse diameter of S1 body (%) \(\frac{{\text{P3}}}{{\text{P2}}}\)
I4S Alar base-wing index Ratio of average bilateral ala width to transverse diameter of S1 body (%) \(\frac{{\text{P4}}}{{\text{P2}}}\)
I5S Auricular index Ratio of average bilateral auricular surface length to sacral basal width (%) \(\frac{{\text{P6}}}{{\text{P1}}}\)
I6S Alar diagonal index Ratio of average bilateral ala width to average bilateral ala anteroposterior (A-P) length (%) \(\frac{{\text{P4}}}{{\text{P7}}}\)