Table 2.

Mean and standard deviation for optical properties and chromophore concentrations in three bony anatomic regions.

Variable	Femur	Humerus	Tibia
$a$ (${\mathrm{mm}}^{-1}$)	$0.8\pm 0.1$	$0.6\pm 0.1$	$0.7\pm 0.1$
$b$ (Arbitrary unit)	$-0.7\pm 0.4$	$-0.5\pm 0.3$	$-1.0\pm 0.3$
${\mathrm{HbO}}_2$ ($\mu \mathrm{M}$)	$35.3\pm 19.4$	$37.0\pm 22.4$	$28.8\pm 11.0$
HHb ($\mu \mathrm{M}$)	$11.3\pm 3.4$	$11.5\pm 3.3$	$10.9\pm 2.4$
Water (%)	$16.0\pm 5.0$	$12.5\pm 3.0$	$27.8\pm 9.2$
Lipids (%)	$28.9\pm 15.1$	$36.9\pm 15.1$	$26.2\pm 8.7$
THC ($\mu \mathrm{M}$)	$46.6\pm 22.1$	$48.6\pm 24.6$	$39.8\pm 12.3$
${\mathrm{StO}}_2$ (%)	$72.8\pm 7.9$	$73.7\pm 5.9$	$70.5\pm 7.4$