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To determine the age-, period-, and cohort-specific effects on the male proportion in Japanese newborns, we performed an age-period-cohort (APC) analysis in this study. In addition, projections for the male proportion were analyzed.

nippon eiseigaku zasshi/nihon eiseigaku zasshi

Age-, Period-, and Birth-Cohort-Specific Effects on the Male Proportion in Japanese Newborns and Projections for Male Proportion for 20 Periods (2008-2027)