Objective measurement of population health is a fundamental requirement of good governance that allows international, regional, national, and local actors to frame evidence-based policy informed by past trends and current performance of health systems.1, 2, 3, 4 Summary measures of population health include techniques that measure the overall burden of health loss due to fatal and non-fatal diseases, as well as measures of expected fatal and non-fatal disease burden based on Socio-demographic Index (SDI).5 The disability-adjusted life-year (DALY) measures health loss due to both fatal and non-fatal disease burden. DALYs are the sum of the years of life lost (YLLs) due to premature mortality and years of life lived with disability (YLDs).6 The YLL is based on remaining life expectancy when compared with a reference standard life table at age of death,7 and the YLD is calculated by multiplying the prevalence of a disease or injury and its main disabling outcomes by its weighted level of severity.6, 8 One DALY represents 1 year of healthy life lost. Examination of levels and trends of DALYs facilitates quick comparison between different diseases and injuries. Conversely, healthy life expectancy (HALE), a metric based ……….

http://www.thelancet.com/journals/lancet/article/PIIS0140-6736(17)32130-X/fulltext?elsca1=etoc

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