Table 2.

Sample sizes, mean values, and standard deviations for the optical and histological variables by tissue type. The mean and range of values demonstrate that FA has the highest % adipose, FG has the highest quantified collagen and ${\mu }_{\mathrm{s}}^{\prime }$, and malignant (IDC and DCIS) sites have the highest quantified glandular parameters.

Tissue type	$n$	$\langle {\mu }_{\mathrm{s}}^{\prime }\rangle$	[$\beta$-carotene]	% Adipose	% Collagen	% Glands
Benign	370	$8.3\pm 4.0$	$20.2\pm 11.8$	$46.4\pm 29.4$	$47.3\pm 25.6$	$5.7\pm 7.2$
A	213	$7.3\pm 3.1$	$21.5\pm 11$	NA	NA	NA
FA	71	$8.5\pm 3.9$	$20.9\pm 14.7$	$64.7\pm 23.0$	$34.5\pm 23.0$	$0.6\pm 1.1$
FG	14	$13.0\pm 7$	$13.6\pm 6.6$	$2.7\pm 3.0$	$81.4\pm 8.7$	$14.3\pm 8.8$
Mix	72	$10.3\pm 4.5$	$16.9\pm 10.5$	$36.9\pm 24.0$	$53.4\pm 21.8$	$9.1\pm 6.9$
Malignant	24	$10.7\pm 4.3$	$28.1\pm 27.4$	$35.0\pm 30.5$	$41.7\pm 24.3$	$21.7\pm 19.6$