Table 5.

Relative odds ratios (OR) and 95% confidence intervals (CI) with increasing levels of computed bilateral mammographic density asymmetry scores in three paired comparisons of different case groups

	Positive vs. Negative			Positive vs. Benign			Benign vs. Negative
Subgroup	Case No.	OR	95%CI	Case No.	OR	95%CI	Case No.	OR	95%CI
1	25 – 68	1.00	baseline	32 – 59	1.00	baseline	33 – 59	1.00	baseline
2	42 – 50	2.28	[1.26, 4.23]	29 – 64	0.84	[0.45, 1.54]	41 – 51	1.43	[0.80, 2.60]
3	49 – 43	3.10	[1.68, 5.73]	46 – 46	1.84	[1.02, 3.34]	46 – 46	1.78	[0.99, 3.23]
4	44 – 48	2.49	[1.35, 4.61]	55 – 37	2.74	[1.51, 4.99]	52 – 40	2.32	[1.28, 4.20]
5	70 – 21	9.07	[4.64, 17.7]	68 – 24	5.22	[2.77, 9.85]	58 – 34	3.05	[1.67, 5.56]
P value 1			0.038			0.014		< 0.001

¹P value for F-test of zero slope of a regression between mammographic density asymmetrical score levels and adjusted odds ratios (in log scale).