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In this study we investigated the secular trends in the mean birth weight of the single births by prefecture and region, using the vital statistics of the Japanese government, and then compared the mean birth weight of single births with that of total births (including the single and multiple births) reported in the previous paper (Ref. 1).doi:10.1265/jjh.32.650 fatcat:oup5g5opqzfahghkk3tujcsgn4