Table 4.

Number needed to screen, number needed to recall, and number of life saved by gastric cancer screening based on future prediction of gastric cancer mortality

Mortality reductiona	Year	Age 45–54						Age 55–64						Age 65–74						Age 75-
		Mortality rate for 10 yearsb (%)	NNSc	NNRd		NLSe		Mortality rate for 10 years (%)	NNS	NNR		NLS		Mortality rate for 10 years (%)	NNS	NNR		NLS		Mortality rate for 10 years (%)	NNS	NNR		NLS
				Recall rate		Participation rate				Recall rate		Participation rate				Recall rate		Participation rate				Recall rate		Participation rate
				5%	10%	50%	100%			5%	10%	50%	100%			5%	10%	50%	100%			5%	10%	50%	100%
RR = 0.5	2010	0.08	2497	125	250	39	233	0.20	1019	51	102	116	698	0.38	525	26	53	192	1149	1.28	156	8	16	706	4236
	2015	0.06	3339	167	334	31	184	0.15	1304	65	130	77	465	0.32	617	31	62	186	1113	1.09	183	9	18	680	4081
	2020	0.04	4893	245	489	23	139	0.12	1722	86	172	56	334	0.30	675	34	68	168	1009	0.98	204	10	20	694	4166
	2025	0.04	5198	260	520	21	128	0.10	1980	99	198	51	308	0.25	792	40	79	123	735	0.91	221	11	22	736	4418
	2030	0.04	5090	255	509	19	113	0.09	2124	106	212	53	315	0.23	887	44	89	104	623	0.90	222	11	22	768	4609
	2035	0.04	4791	240	479	18	105	0.09	2234	112	223	49	293	0.21	959	48	96	102	611	0.92	218	11	22	775	4650
RR = 0.6	2010	0.08	3121	156	312	30	177	0.20	1273	64	127	89	532	0.38	656	33	66	146	876	1.28	195	10	19	538	3227
	2015	0.06	4174	209	417	23	140	0.15	1630	82	163	59	354	0.32	771	39	77	141	848	1.09	229	11	23	518	3109
	2020	0.04	6117	306	612	18	106	0.12	2153	108	215	42	254	0.30	844	42	84	128	769	0.98	255	13	25	529	3174
	2025	0.04	6497	325	650	16	97	0.10	2475	124	247	39	234	0.25	990	50	99	93	560	0.91	276	14	28	561	3366
	2030	0.04	6363	318	636	14	86	0.09	2655	133	266	40	240	0.23	1109	55	111	79	474	0.90	277	14	28	585	3511
	2035	0.04	5989	299	599	13	80	0.09	2792	140	279	37	223	0.21	1199	60	120	78	466	0.92	273	14	27	590	3543
RR = 0.7	2010	0.08	4161	208	416	21	127	0.20	1698	85	170	63	381	0.38	875	44	88	104	627	1.28	260	13	26	385	2311
	2015	0.06	5565	278	557	17	100	0.15	2173	109	217	42	253	0.32	1028	51	103	101	607	1.09	306	15	31	371	2226
	2020	0.04	8156	408	816	13	76	0.12	2870	144	287	30	182	0.30	1125	56	113	92	550	0.98	339	17	34	379	2273
	2025	0.04	8663	433	866	12	70	0.10	3300	165	330	28	168	0.25	1320	59	132	67	401	0.91	368	18	37	402	2410
	2030	0.04	8484	424	848	10	61	0.09	3541	177	354	29	172	0.23	1478	74	148	57	340	0.90	370	18	37	419	2514
	2035	0.04	7985	399	799	10	57	0.09	3723	186	372	27	160	0.21	1599	80	160	56	333	0.92	363	18	36	423	2536
RR = 0.8	2010	0.08	6241	312	624	14	81	0.20	2546	127	255	40	243	0.38	1313	66	131	67	400	1.28	390	19	39	246	1473
	2015	0.06	8348	417	835	11	64	0.15	3260	163	326	27	162	0.32	1542	77	154	65	387	1.09	459	23	46	237	1420
	2020	0.04	12234	612	1223	8	48	0.12	4306	215	431	19	116	0.30	1688	84	169	58	351	0.98	509	25	51	242	1449
	2025	0.04	12994	650	1299	7	44	0.10	4949	247	495	18	107	0.25	1980	99	198	43	256	0.91	551	28	55	256	1537
	2030	0.04	12726	636	1273	7	39	0.09	5311	266	531	18	110	0.23	2218	111	222	36	217	0.90	554	28	55	267	1603
	2035	0.04	11978	599	1198	6	37	0.09	5584	279	558	17	102	0.21	2398	120	240	35	213	0.92	545	27	55	270	1617
RR = 0.9	2010	0.08	12483	624	1248	6	39	0.20	5093	255	509	19	116	0.38	2626	131	263	32	192	1.28	779	39	78	118	706
	2015	0.06	16695	835	1670	5	31	0.15	6520	326	652	13	77	0.32	3083	154	308	31	186	1.09	917	46	92	113	680
	2020	0.04	24467	1223	2447	4	23	0.12	8611	431	861	9	56	0.30	3376	169	338	28	168	0.98	1018	51	102	116	694
	2025	0.04	25988	1299	2599	4	21	0.10	9899	495	990	9	51	0.25	3960	198	396	20	123	0.91	1103	55	110	123	736
	2030	0.04	25452	1273	2545	3	19	0.09	10622	531	1062	9	53	0.23	4435	222	444	17	104	0.90	1109	55	111	128	768
	2035	0.04	23955	1198	2396	3	18	0.09	11169	558	1117	8	49	0.21	4796	240	480	17	102	0.92	1090	55	109	129	775

^aRelative risk for mortality reduction by screening

^bGastric cancer mortality rate fro 10 years

^cNumber needed to screen

^dNumber needed to recall

^eNumber of life saved