Mortality differences by surgical volume among patients with stomach cancer: a threshold for a favorable volume-outcome relationship

Choi, Hyeok; Yang, Seong-Yoon; Cho, Hee-Seung; Kim, Woorim; Park, Eun-Cheol; Han, Kyu-Tae

doi:10.1186/s12957-017-1203-7

Table 1 General characteristics of patients with stomach cancer at baseline and distribution of those by cancer-specific mortality

From: Mortality differences by surgical volume among patients with stomach cancer: a threshold for a favorable volume-outcome relationship

Variables	Total		Died		Survived		P value
Variables	N/mean	%/SD	N/mean	%/SD	N/mean	%/SD	P value
Sex
Male	1739	68.20	314	18.06	1425	81.94	0.0598
Female	811	31.80	122	15.04	689	84.96
Age (years)
−39	110	4.31	14	12.73	96	87.27	<0.0001
40–49	379	14.86	48	12.66	331	87.34
50–59	650	25.49	82	12.62	568	87.38
60–69	768	30.12	137	17.84	631	82.16
70+	643	25.22	155	24.11	488	75.89
Income
−40	716	28.08	127	17.74	589	82.26	0.6956
41–70	678	26.59	113	16.67	565	83.33
71–90	692	27.14	124	17.92	568	82.08
91+	464	18.20	72	15.52	392	84.48
Types of insurance coverage
Medical aid	87	3.41	23	26.44	64	73.56	0.0399
NHI, self-employed	915	35.88	162	17.70	753	82.30
NHI, employed	1548	60.71	251	16.21	1297	83.79
Year of surgery
2004	238	9.33	70	29.41	168	70.59	<0.0001
2005	244	9.57	59	24.18	185	75.82
2006	229	8.98	50	21.83	179	78.17
2007	216	8.47	60	27.78	156	72.22
2008	266	10.43	46	17.29	220	82.71
2009	252	9.88	48	19.05	204	80.95
2010	263	10.31	44	16.73	219	83.27
2011	288	11.29	26	9.03	262	90.97
2012	280	10.98	27	9.64	253	90.36
2013	274	10.75	6	2.19	268	97.81
Types of surgery
Total gastrectomy	552	21.65	174	31.52	378	68.48	<0.0001
Subtotal gastrectomy	1998	78.35	262	13.11	1736	86.89
Types of treatment
With chemotherapy and radiotherapy	44	1.73	27	61.36	17	38.64	<0.0001
With chemotherapy	373	14.63	178	47.72	195	52.28
With radiotherapy	9	0.35	7	77.78	2	22.22
Only surgery	2124	83.29	224	10.55	1900	89.45
Dissection of lymph node
Yes	2531	99.25	431	17.03	2075	81.98	0.3081
No	44	1.73	5	11.36	39	88.64
CCI	0.79	1.43	1.05	1.72	0.74	1.36	<0.0001
Hospital characteristics
Hospital volume
Low (N = 368)	436	17.10	59	13.53	377	86.47	<0.0001
Mid-low (N = 292)	357	14.00	40	11.20	317	88.80
Mid-high (N = 27)	1273	49.92	227	17.83	1046	82.17
High (N = 17)	484	18.98	110	22.73	374	77.27
Region of hospital
Capital area (N = 328)	951	37.29	150	15.77	801	84.23	0.1705
Others (N = 376)	905	35.49	286	31.60	1313	145.08
Types of medical institution
General hospital (N = 689)	2531	99.25	430	16.99	2101	83.01	0.0924
Hospital (N = 15)	19	0.75	6	31.58	13	68.42
Total	2550	100.00	436	17.10	2114	82.90

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ISSN: 1477-7819

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