Abstract
In The Lancet today, Gary King and colleagues1 present an innovative cluster-randomised trial of health insurance—Seguro Popular—in Mexico. Rigorous research on health-systems issues is much needed,2 and the investigators break new ground with one of the largest randomised health-policy experiments ever. The main finding was a reduction in catastrophic expenditures on health of 1·9%. Such expenditures were defined as health-spending share of a household's spending capacity after a minimum food budget; expenditures were defined as catastrophic if a household's health spending exceeded 30% of that capacity.
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