Table 2.

Optical properties summary data across vertebral body regions.

Optical properties	Vertebral body regions
	Inner ($N=40$)	Outer ($N=40$)
	Median	Median	$P$ value
Blood (%)	4.0	2.8	0.04
Fat (%)	21.0	20.0	0.79
Water (%)	31.4	30.1	0.85
Scattering (${\mathrm{cm}}^{-1}$)	9.9	9.7	0.95