Impact of endoscopic screening on mortality reduction from gastric cancer

Table 4 Comparison of standardized mortality ratio among the screening groups

Reference population	Group		Gastric cancer deaths			All cancer deaths except gastric cancer deaths
			Observed number	Expected number	SMR (95%CI)	Observed number	Expected number	SMR (95%CI)
Niigata city	Endoscopy	Total	24	56	0.43 (0.30-0.57)	216	349	0.62 (0.57-0.67)
		Men	18	37	0.49 (0.32-0.66)	154	220	0.7 (0.64-0.76)
		Women	6	20	0.31 (0.12-0.54)	62	129	0.48 (0.39-0.57)
	Regular radiography	Total	43	63	0.68 (0.55-0.79)	266	393	0.68 (0.63-0.73)
		Men	29	40	0.72 (0.56-0.85)	173	244	0.71 (0.65-0.77)
		Women	14	23	0.62 (0.39-0.80)	93	149	0.62 (0.53-0.70)
	Photofluorography	Total	38	45	0.85 (0.71-0.94)	208	281	0.74 (0.68-0.79)
		Men	31	27	1.13 (1.04-1.43)	130	169	0.77 (0.70-0.83)
		Women	7	17	0.41 (0.18-0.67)	78	112	0.69 (0.59-0.77)
Niigata prefecture	Endoscopy	Total	24	58	0.41 (0.29-0.55)	216	329	0.66 (0.61-0.71)
		Men	18	39	0.47 (0.30-0.63)	154	204	0.75(0.68-0.81)
		Women	6	20	0.3 (0.12-0.54)	62	125	0.5 (0.41-0.59)
	Regular radiography	Total	43	66	0.66 (0.52-0.76)	266	371	0.72 (0.67-0.76)
		Men	29	43	0.68 (0.44-0.75)	173	227	0.76 (0.70-0.82)
		Women	14	23	0.61 (0.39-0.80)	93	144	0.64 (0.56-0.72)
	Photofluorography	Total	38	46	0.83 (0.69-0.92)	208	264	0.79 (0.74-0.84)
		Men	31	29	1.08 (1.01-1.27)	130	157	0.83 (0.76-0.88)
		Women	7	17	0.41 (0.18-0.67)	78	108	0.72 (0.63-0.80)
Japan	Endoscopy	Total	24	54	0.45 (0.31-0.59)	216	357	0.6 (0.55-0.65)
		Men	18	36	0.5 (0.33-0.67)	154	214	0.72 (0.65-0.78)
		Women	6	18	0.34 (0.13-0.59)	62	143	0.43 (0.34-0.51)
	Regular radiography	Total	43	60	0.71 (0.59-0.83)	266	403	0.66 (0.61-0.71)
		Men	29	40	0.73 (0.56-0.85)	173	238	0.73 (0.67-0.79)
		Women	14	21	0.68 (0.43-0.85)	93	165	0.56 (0.48-0.63)
	Photofluorography	Total	38	42	0.9 (0.77-0.97)	208	287	0.73 (0.68-0.78)
		Men	31	27	1.15 (1.04-1.43)	130	164	0.79 (0.72-0.85)
		Women	7	15	0.46 (0.21-0.73)	78	123	0.64 (0.53-0.71)

SMR: Standardized mortality ratio.