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[The effect of determining birthdays by social factors such as maternal preference on the distribution in the number of daily live births].

Authors
  • Takahashi, Mihoko
  • Nishina, Motoko
  • Ohta, Akiko
Type
Published Article
Journal
[Nihon kōshū eisei zasshi] Japanese journal of public health
Publication Date
Jan 01, 2014
Volume
61
Issue
1
Pages
16–29
Identifiers
PMID: 24572049
Source
Medline
License
Unknown

Abstract

The variations in the days of the week were inconsistent with nationwide policies for consultation in each setting. These results indicate that some birth dates were set for institutional reasons or maternal preferences (i.e., the day after the leap day or the next school year) by using or avoiding obstetric intervention. The abnormal variation on leap days and on April 1st might be related to fictitious reporting. More recent variations in the birth number ratio on specific days suggest that some individuals may avoid obstetric intervention. The results of this study indicate that determining birthdays by social factors may have been practiced in maternity homes until approximately 1990.

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