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The authors aimed to assist in setting a baseline against which to assess progress towards the achievement of the World Health Assembly targets for reductions in low birth weight (LBW) prevalence. The authors collated data on 1447 country-years of birthweight data (281 million births) for 148 countries of 195 UN member states (47 countries had no data meeting inclusion criteria). The estimated worldwide LBW prevalence in 2015 was 14·6% compared with 17·5% in 2000 (average annual reduction rate 1·23%). In 2015, an estimated 20·5 million livebirths were LBW, 91% from low-and-middle income countries, mainly southern Asia (48%) and sub-Saharan Africa (24%).


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