TABLE I.

Cases of radiation therapy for bone metastases, including fractionation and site of radiation, overall and by year

Variable	Overall		2005		2006		2007		2008		2009		2010		2011		2012
	(n)	(%)	(n)	(%)	(n)	(%)	(n)	(%)	(n)	(%)	(n)	(%)	(n)	(%)	(n)	(%)	(n)	(%)
Radiation fraction
Single	1659	65.14	77	66.38	184	67.65	256	71.31	299	66.30	267	58.94	297	65.56	208	65.20	71	57.26
Multiple	888	34.86	39	33.62	88	32.35	103	28.69	152	33.70	186	41.06	156	34.44	111	34.80	53	42.74
Radiation fraction details
Single	1659	65.08	77	66.38	184	67.40	256	71.31	299	66.15	267	58.94	297	65.56	208	65.20	71	57.26
Multiple
20 Gy in 5 fractions	738	28.95	28	24.14	66	24.18	92	25.63	129	28.54	161	35.54	128	28.26	92	28.84	42	33.87
30 Gy in 10 fractions	75	2.94	3	2.59	5	1.83	4	1.11	9	1.99	11	2.43	21	4.64	13	4.08	9	7.26
Others	75	2.94	8	6.90	17	6.23	7	1.95	14	3.10	14	3.09	7	1.55	6	1.88	2	1.61
Unknown	2	0.08	0	0.00	1	0.37	0	0.00	1	0.22	0	0.00	0	0.00	0	0.00	0	0.00
Radiation site
Spine	1172	45.98	48	41.38	125	45.79	160	44.57	217	48.01	203	44.81	205	45.25	154	48.28	60	48.39
Limbs, hip, skull	649	25.46	36	31.03	62	22.71	83	23.12	113	25.00	131	28.92	111	24.50	79	24.76	34	27.42
Ribs, scapula, sternum, clavicle	388	15.22	14	12.07	42	15.38	61	16.99	63	13.94	66	14.57	77	17.00	51	15.99	14	11.29
Pelvis	325	12.75	18	15.52	42	15.38	48	13.37	54	11.95	53	11.70	60	13.25	34	10.66	16	12.90
Unknown	15	0.59	0	0.00	2	0.73	7	1.95	5	1.11	0	0.00	0	0.00	1	0.31	0	0.00