Table 2.

Base-case benefit–cost ratios including productivity benefits of preventing Shigella-attributable growth faltering through vaccination

	Average retirement scenario				Early retirement scenario
	Income effect		Multiplier effect		Income effect		Multiplier effect
	Discounting 3%	Discounting 6%	Discounting 3%%	Discounting 6%	Discounting 3%%	Discounting 6%	Discounting 3%%	Discounting 6%
LICs and LMICs only
African region	8·52	2·63	23·00	7·62	4·98	1·95	14·61	5·99
Region of the Americas	3·32	1·18	12·62	4·49	2·38	1·00*	9·06	3·79
Eastern Mediterranean region	2·90	0·97*	8·01	2·73	1·92	0·77*	5·40	2·22
European region	4·06	1·36	15·43	5·15	2·70	1·09*	10·27	4·15
South-East Asia region	21·67	5·95	40·51	11·14	11·00	3·97	20·61	7·45
Western Pacific region	6·56	1·92	12·35	3·63	3·66	1·37	6·95	2·61
Gavi-eligible countries	14·45	4·11	30·42	8·95	7·63	2·83	16·78	6·38
Overall	11·60	3·34	24·55	7·31	6·23	2·32	13·78	5·27
LICs, LMICs, and UMICs
African region	8·11	2·53	21·59	7·18	4·81	1·89	13·80	5·67
Region of the Americas	10·85	3·97	20·85	7·62	8·02	3·41	15·40	6·54
Eastern Mediterranean region	2·69	0·91*	7·06	2·42	1·80	0·73*	4·79	1·98
European region	4·65	1·61	10·54	3·61	3·23	1·33	7·27	2·98
South-East Asia region	15·26	4·27	28·52	8·00	7·97	2·91	14·92	5·46
Western Pacific region	5·68	1·73	10·60	3·22	3·38	1·29	6·31	2·41
Gavi-eligible countries	14·45	4·11	30·42	8·95	7·63	2·83	16·78	6·38
Overall	8·53	2·58	17·26	5·31	4·94	1·90	10·22	3·97

Average retirement age was defined as 64 years as per the OECD, whereas early retirement age was defined as 50 years. LIC=low-income country. LMIC=lower-middle-income country. OECD=Organisation for Economic Co-operation and Development. UMIC=upper-middle-income country.

^*Results less than or equal to 1·10, representing ratios that are below parity or borderline.