Propaganda-oriented Population Policy of 2010s Japan

- Politically misused scientific knowledge
TANAKA Sigeto <>
(Tohoku University)



The Government of Japan and some academic associations in the fields of obstetrics, gynecology, and reproductive medicine used a falsified chart exaggerating the decline in women's fecundity during their late-20s. It was used in a campaign to promote “scientific” knowledge about the suitable age range for pregnancy, targeting female students in high-schools. It is not only a scandal about use of falsified data violating academic ethics, but also a case of abusive use of scientific knowledge in a certain political context.

Table of Contents

Overview of the Problems

IFDMS: Misinformation with a Low-Quality Survey

[Clipping on IFDMS]

Daily Fecundability Estimates with Unknown Method (Dunson et al. 2002)

[Clipping on Dunson et al. (2002)]

A Trimmed Age-Fertility Chart (JSRM 2013)

[Clipping on JSRM (2013)]

Widely Used Age-Fecundity Chart of Dubious Origin

[Clipping on this chart]

Falsified Age-Fecundability Chart in High-school Educational Material

Process of falsification

Editorial process of the educational material

The online edition of the textbook is available from Upon each successive revision, the preceding edition is deleted. However, past editions can be found on archive sites such as

Literature on the age-fecundability profile

The concept of “egg aging” and the changes in its meaning

[Clipping on the concept of “egg aging”]

Exaggerated decreasing of the number of eggs in women's ovaries

[Clipping on graphs emphasizing age-related decline in the population of germ cells]

Accountability and Academic Integrity

Related Issues

Urayasu Mayor's speech on 2016 coming-of-age ceremony

Propaganda by local governments

[Clipping on local governments]

Unscientific information by doctors and organizations

The Fourth Basic Plan for Gender Equality, 2015

List of Documents Written by Tanaka

Information Sources

Tohoku Univ / School of Arts and Letters / Applied Japanese Linguistics / TANAKA Sigeto

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