Fig. 5.

Spearman correlation coefficients (r _s) for the original UDI and UDI variants with one or two dental indicators removed (N = 10). For example, in the first section, the UDI was calculated using three of the four dental indicators for each combination of four indicators (N = $\left(\begin{array}{c}\hfill 4\hfill \\ \hfill 3\hfill \end{array}\right)=\left(\frac{4!}{3!\times 1!}\right)$) = four combinations