Contraceptive Prevalence Rates at Initial and Latest Surveys,a by Wealth Quintile, 46 Low- and Middle-Income Countriesa Survey years varied by country, ranging from 1990 in the initial surveys to 2013 in the latest surveys. Contraceptive Prevalence Rates at Initial and Latest Surveys,a by Wealth Quintile, 46 Low- and Middle-Income Countriesa Survey years varied by country, ranging from 1990 in the initial surveys to 2013 in the latest surveys. John Ross Glob Health Sci Pract 2015;3:419-445 © 2017 Creative Commons Attribution 4.0 International License