Table 2.

Correlation coefficient ($r$) between fitted ${\mu }_{\mathrm{a}}$ and ${\mu }_{\mathrm{s}}^{\prime }$ with chest wall depth of entire population and different races (total $n=285$, black $n=45$, Asian and Hispanic $n=46$, white $n=137$).

Background properties	Race	Chest wall depth (cm)	Wavelength
			740 nm	780 nm	808 nm	830 nm
${\mu }_{\mathrm{a}}$ (${\mathrm{cm}}^{-1}$)	All patients	$2.57\pm 0.66$	0.6656	0.6733	0.6739	0.6652
	Black	$2.58\pm 0.68$	0.6998	0.7164	0.7046	0.6593
	Asian and Hispanic	$2.49\pm 0.70$	0.6777	0.6594	0.6765	0.6596
	White	$2.53\pm 0.62$	0.7752	0.7773	0.7800	0.7803
${\mu }_{\mathrm{s}}^{\prime }$ (${\mathrm{cm}}^{-1}$)	All patients	$2.57\pm 0.66$	0.3311	0.3109	0.2721	0.2702
	Black	$2.58\pm 0.68$	0.2972	0.3203	0.1975	0.2022
	Asian and Hispanic	$2.49\pm 0.70$	0.1746	0.2223	0.0927	0.2727
	White	$2.53\pm 0.62$	0.3845	0.3389	0.3719	0.3213