Table 1.

Optical properties summary data across vertebral bone type.

	Vertebral bone type
Optical properties	Cancellous bone ($N=147$)	Cortical bone ($N=119$)
	Median	Median	$P$ value
Blood (%)	4.2	2.1	$<{10}^{-5}$
Fat (%)	17.4	3.2	$<{10}^{-5}$
Water (%)	31.7	53.1	0.0115
Scattering (${\mathrm{cm}}^{-1}$)	10.5	5.0	$<{10}^{-5}$