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Prenatal war exposure and schizophrenia in adulthood: evidence from the Sino-Japanese War of 1937–1945

  • Ping He
  • Yanan Luo
  • Chao Guo
  • Gong Chen
  • Xinming Song
  • Xiaoying ZhengEmail author
Original Paper

Abstract

Purpose

This study aimed to examine the long-term effect of prenatal exposure to the Sino-Japanese War during 1937–1945 on risk of schizophrenia in adulthood among Chinese wartime survivors.

Methods

We obtained data from the Second National Sample Survey on Disability conducted in 31 provinces in 2006. We restricted our analysis to 369,469 adults born between 1931 and 1950. Schizophrenia was ascertained by psychiatrists based on the International Statistical Classification of Diseases 10th Revision. War intensity was assessed by the ratio of war-caused civilian casualties to the pre-war population. The effect of prenatal exposure to war on schizophrenia was estimated by difference-in-difference models, established by examining the variation of war across birth cohorts.

Results

In the male population, war cohorts of 1937–1946 had no significant higher odds of schizophrenia compared with the pre-war cohorts of 1931–1936. In the female population, war cohorts were 1.16 (95% CI 1.01, 1.33) times more likely than pre-war cohorts to have schizophrenia. Sensitive analyses show that our estimates of war effect on schizophrenia were robust and valid.

Conclusions

Prenatal exposure to the Sino-Japanese War of 1937–1945 had long-run detrimental effect on risk of schizophrenia in the female adults. Further investigations are warranted to extend the enduring wartime impact on other health outcomes in China.

Keywords

The Sino-Japanese War Schizophrenia Long-term effect Life course 

Notes

Acknowledgements

The authors thank the provincial and municipal federations of disabled people for their support in data collection and management. The work was supported by Peking University’s Start-up Fund (No. BMU2018YJ004), the Key National Project (973) of Study on the Mechanisms of Interaction between Environment and Genetics of Birth Defects in China (Grant No. 2007CB5119001), the Key State funds for social science project (Research on Disability Prevention Measurement in China, Grant No. 09&ZD072), and the State Scholarship Fund (Grant No. 201606010254).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no potential conflict of interest.

Supplementary material

127_2018_1584_MOESM1_ESM.docx (18 kb)
Supplementary material 1 (DOCX 17 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Ping He
    • 1
    • 2
    • 3
  • Yanan Luo
    • 2
  • Chao Guo
    • 2
    • 4
  • Gong Chen
    • 2
  • Xinming Song
    • 2
  • Xiaoying Zheng
    • 2
    • 4
    Email author
  1. 1.China Center for Health Development StudiesPeking UniversityBeijingChina
  2. 2.Institute of Population ResearchPeking UniversityBeijingPeople’s Republic of China
  3. 3.Bloomberg School of Public HealthJohns Hopkins UniversityBaltimoreUSA
  4. 4.APEC Health Science Academy (HeSAY), Peking UniversityBeijingChina

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