Table 2.

Incidence and characteristics of newly diagnosed primary malignant spine tumor during 2009–2011 in South Korea

Variable	Total			Vertebral column			Pelvis, sacrum, coccyx			Spinal meninges			Spinal cord
	N (%)	Rate	p-value	n (%)	Rate	p-value	n (%)	Rate	p-value	n (%)	Rate	p-value	n (%)	Rate	p-value
Total	266	0.70 [0.62, 0.79]		98	0.26 [0.21, 0.31]		15	0.04 [0.02, 0.06]		9	0.02 [0.01, 0.04]		144	0.38 [0.32, 0.44]
Age at diagnosis, y
20–29	23 (8.6)	0.32 [0.19, 0.45]	<0.001	2 (2.0)	0.03 [0.00, 0.07]	<0.001	3 (20.0)	0.04 [0.00, 0.09]	0.215	1 (11.1)	0.01 [0.00, 0.04]	0.145	17 (11.8)	0.24 [0.13, 0.35]	0.002
30–39	34 (12.8)	0.40 [0.27, 0.54]		5 (5.1)	0.06 [0.01, 0.11]		2 (13.3)	0.02 [0.00, 0.06]		1 (11.1)	0.01 [0.00, 0.04]		26 (18.1)	0.31 [0.19, 0.43]
40–49	39 (14.7)	0.45 [0.31, 0.59]		10 (10.2)	0.11 [0.04, 0.19]		2 (13.3)	0.02 [0.00, 0.05]		-	-		27 (18.8)	0.31 [0.19, 0.43]
50–59	68 (25.6)	1.08 [0.82, 1.33]		22 (22.4)	0.35 [0.20, 0.49]		2 (13.3)	0.03 [0.00, 0.08]		4 (44.4)	0.06 [0.00, 0.13]		40 (27.8)	0.63 [0.44, 0.83]
60–69	46 (17.3)	1.15 [0.82, 1.48]		21 (21.4)	0.52 [0.30, 0.75]		2 (13.3)	0.05 [0.00, 0.12]		2 (22.2)	0.05 [0.00, 0.12]		21 (14.6)	0.52 [0.30, 0.75]
≥ 70	56 (21.1)	1.72 [1.27, 2.17]		38 (38.8)	1.17 [0.80, 1.54]		4 (26.7)	0.12 [0.00, 0.24]		1 (11.1)	0.03 [0.00, 0.09]		13 (9.0)	0.40 [0.18, 0.62]
Sex
Male	149 (56.0)	0.80 [0.67, 0.93]	0.03	54 (55.1)	0.29 [0.21, 0.37]	0.256	6 (40.0)	0.03 [0.01, 0.06]	0.468	3 (33.3)	0.02 [0.00, 0.03]	0.336	86 (59.7)	0.46 [0.36, 0.56]	0.013
Female	117 (44.0)	0.61 [0.50, 0.72]		44 (44.9)	0.23 [0.16, 0.30]		9 (60.0)	0.05 [0.02, 0.08]		6 (66.7)	0.03 [0.01, 0.06]		58 (40.3)	0.30 [0.22, 0.38]
Annual incidence
2009	85 (32.0)	0.22 [0.18, 0.27]	0.379	36 (36.7)	0.10 [0.06, 0.13]	0.36	4 (26.7)	0.01 [0.00, 0.02]	0.548	4 (44.4)	0.01 [0.00, 0.02]	0.368	41 (28.5)	0.11 [0.08, 0.14]	0.358
2010	81 (30.5)	0.21 [0.17, 0.26]		26 (26.5)	0.07 [0.04, 0.09]		7 (46.7)	0.02 [0.00, 0.03]		1 (11.1)	0.00 [0.00, 0.01]		47 (32.6)	0.12 [0.09, 0.16]
2011	100 (37.6)	0.26 [0.21, 0.31]		36 (36.7)	0.09 [0.06, 0.12]		4 (26.7)	0.01 [0.00, 0.02]		4 (44.4)	0.01 [0.00, 0.02]		56 (38.9)	0.14 [0.11, 0.18]
Type of health insurance
Medicare	246 (92.5)	0.65 [0.57, 0.73]	<0.001	90 (91.8)	0.24 [0.19, 0.29]	<0.001	13 (86.7)	0.03 [0.02, 0.05]	0.005	8 (88.9)	0.02 [0.01, 0.04]	0.02	135 (93.8)	0.36 [0.30, 0.42]	<0.001
Medicaid	20 (7.5)	0.05 [0.03, 0.08]		8 (8.2)	0.02 [0.01, 0.04]		2 (13.3)	0.01 [0.00, 0.01]		1 (11.1)	0.00 [0.00, 0.01]		9 (6.3)	0.02 [0.01, 0.04]

95% confidential interval was stated in the bracket. Bold style indicates statistical significance. CI: confidence interval, y: year