A Quantitative Method for the Characterization of Lytic Metastases of the Bone from Radiographic Images

Table 1

Descriptive statistics for the three parameters studied: mean (MGL), standard deviation (SDGL), and coefficient of variation (CVGL) of gray level.

	Groups	Mean	St. dev.	Min.	Max.
MGL	MM1	1710.42	332.25	1264	2017
	OL1	1634.13	269.36	1312	2000
	MM2	1593.21	140.87	1406	1840
	OL2	1744.53	176.75	1472	2096
SDGL	MM1	256.89	12.98	242.37	277.56
	OL1	258.56	20.43	228.64	295.52
	MM2	248.12	9.51	238.10	264.27
	OL2	270.66	16.80	240.64	301.28
CVGL	MM1	15.02	3.09	12.64	20.43
	OL1	16.14	2.41	12.85	20.34
	MM2	15.57	1.45	13.23	16.87
	OL2	15.64	1.56	12.02	18.61

Note. Multiple myeloma: MM1 (nonflat bone) and MM2 (flat bone); osteolytic metastases: OL1 (nonflat bone) and OL2 (flat bone).