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Spearman correlation between HDI-2014 and the prevalence of twin pregnancies in Brazilian states, SINASC 2011-2014. (The Spearman correlation coefficient for North and Northeast regions is -0.24, while for the southern, southeastern, and midwestern regions it is 0.71; the Spearman correlation coefficient for the whole country is 0.69.) Legend for color circles: red: states from the North region; blue: Northeast; black: Midwestern; green: Southeast; orange: South region.
