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Where should the world invest?

Deaths in children under 5 have fallen impressively in the past quarter of a century: they’ve nearly halved since 1990. But they are still not falling fast enough for the world to meet the millennium development goal to reduce childhood deaths by two thirds by 2015. Progress is especially slow in the poorest countries. So with the clock ticking the search is on for the best development bets. Where should countries invest for the quickest and biggest gains in life expectancy?

Matthieu Hanf and colleagues have done their best to move us towards an evidence based answer (doi:10.1136/bmj.f6427). They reviewed 10 years’ worth of annual data on the determinants …