Effects of the Great East Japan Earthquake on secondary sex ratio and perinatal outcomes

Kohta Suzuki, Zentaro Yamagata, Miyuki Kawado, Shuji Hashimoto

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Background: The effect of natural disasters on secondary sex ratio (SSR) and perinatal outcomes has been suggested. This study aimed to examine effects of the Great East Japan Earthquake on perinatal outcomes using vital statistics of Japan. Methods: Birth registration data from vital statistics of Japan between March 2010 and March 2012 were used. Pregnant women who experienced the earthquake were categorized according to their gestational period as of March 11, 2011, as follows: gestational weeks 4-11, 12-19, 20-27, and 28-36 (2011 group). Similarly, pregnant women who did not experience the earthquake were categorized according to their gestational period as of March 11, 2010 and used as controls (2010 group). We also categorized prefectures as "extremely affected", "moderately affected", and "slightly or unaffected" regions. SSR, birth weight, and gestational period were compared between both groups. Results: The number of singleton births was 688 479 in the 2010 group and 679 131 in the 2011 group. In the extremely affected region, the SSR among women at 4-11 weeks of gestation was significantly lower in the 2011 group compared with the 2010 group (49.8% vs 52.1%, P = 0.009). In the extremely affected region, children born to women who experienced the earthquake at 28-36 weeks of gestation had significantly lower birth weights. Conclusions: The SSR declined among women who experienced the earthquake during early pregnancy, particularly in the extremely affected region. However, no apparent negative effect of the earthquake on perinatal outcomes was observed, although birth weight of infants who were born to women who experienced the earthquake at 28-36 weeks of gestation were lower.

Original languageEnglish
Pages (from-to)76-83
Number of pages8
JournalJournal of epidemiology
Volume26
Issue number2
DOIs
Publication statusPublished - 01-01-2016

Fingerprint

Earthquakes
Sex Ratio
Japan
Birth Weight
Pregnancy
Vital Statistics
Pregnant Women
Parturition
Disasters
Control Groups

All Science Journal Classification (ASJC) codes

  • Epidemiology

Cite this

Suzuki, Kohta ; Yamagata, Zentaro ; Kawado, Miyuki ; Hashimoto, Shuji. / Effects of the Great East Japan Earthquake on secondary sex ratio and perinatal outcomes. In: Journal of epidemiology. 2016 ; Vol. 26, No. 2. pp. 76-83.
@article{2f46487f18fd46b7a08eca1335d8c683,
title = "Effects of the Great East Japan Earthquake on secondary sex ratio and perinatal outcomes",
abstract = "Background: The effect of natural disasters on secondary sex ratio (SSR) and perinatal outcomes has been suggested. This study aimed to examine effects of the Great East Japan Earthquake on perinatal outcomes using vital statistics of Japan. Methods: Birth registration data from vital statistics of Japan between March 2010 and March 2012 were used. Pregnant women who experienced the earthquake were categorized according to their gestational period as of March 11, 2011, as follows: gestational weeks 4-11, 12-19, 20-27, and 28-36 (2011 group). Similarly, pregnant women who did not experience the earthquake were categorized according to their gestational period as of March 11, 2010 and used as controls (2010 group). We also categorized prefectures as {"}extremely affected{"}, {"}moderately affected{"}, and {"}slightly or unaffected{"} regions. SSR, birth weight, and gestational period were compared between both groups. Results: The number of singleton births was 688 479 in the 2010 group and 679 131 in the 2011 group. In the extremely affected region, the SSR among women at 4-11 weeks of gestation was significantly lower in the 2011 group compared with the 2010 group (49.8{\%} vs 52.1{\%}, P = 0.009). In the extremely affected region, children born to women who experienced the earthquake at 28-36 weeks of gestation had significantly lower birth weights. Conclusions: The SSR declined among women who experienced the earthquake during early pregnancy, particularly in the extremely affected region. However, no apparent negative effect of the earthquake on perinatal outcomes was observed, although birth weight of infants who were born to women who experienced the earthquake at 28-36 weeks of gestation were lower.",
author = "Kohta Suzuki and Zentaro Yamagata and Miyuki Kawado and Shuji Hashimoto",
year = "2016",
month = "1",
day = "1",
doi = "10.2188/jea.JE20150055",
language = "English",
volume = "26",
pages = "76--83",
journal = "Journal of Epidemiology",
issn = "0917-5040",
publisher = "Japan Epidemiology Association",
number = "2",

}

Effects of the Great East Japan Earthquake on secondary sex ratio and perinatal outcomes. / Suzuki, Kohta; Yamagata, Zentaro; Kawado, Miyuki; Hashimoto, Shuji.

In: Journal of epidemiology, Vol. 26, No. 2, 01.01.2016, p. 76-83.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of the Great East Japan Earthquake on secondary sex ratio and perinatal outcomes

AU - Suzuki, Kohta

AU - Yamagata, Zentaro

AU - Kawado, Miyuki

AU - Hashimoto, Shuji

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Background: The effect of natural disasters on secondary sex ratio (SSR) and perinatal outcomes has been suggested. This study aimed to examine effects of the Great East Japan Earthquake on perinatal outcomes using vital statistics of Japan. Methods: Birth registration data from vital statistics of Japan between March 2010 and March 2012 were used. Pregnant women who experienced the earthquake were categorized according to their gestational period as of March 11, 2011, as follows: gestational weeks 4-11, 12-19, 20-27, and 28-36 (2011 group). Similarly, pregnant women who did not experience the earthquake were categorized according to their gestational period as of March 11, 2010 and used as controls (2010 group). We also categorized prefectures as "extremely affected", "moderately affected", and "slightly or unaffected" regions. SSR, birth weight, and gestational period were compared between both groups. Results: The number of singleton births was 688 479 in the 2010 group and 679 131 in the 2011 group. In the extremely affected region, the SSR among women at 4-11 weeks of gestation was significantly lower in the 2011 group compared with the 2010 group (49.8% vs 52.1%, P = 0.009). In the extremely affected region, children born to women who experienced the earthquake at 28-36 weeks of gestation had significantly lower birth weights. Conclusions: The SSR declined among women who experienced the earthquake during early pregnancy, particularly in the extremely affected region. However, no apparent negative effect of the earthquake on perinatal outcomes was observed, although birth weight of infants who were born to women who experienced the earthquake at 28-36 weeks of gestation were lower.

AB - Background: The effect of natural disasters on secondary sex ratio (SSR) and perinatal outcomes has been suggested. This study aimed to examine effects of the Great East Japan Earthquake on perinatal outcomes using vital statistics of Japan. Methods: Birth registration data from vital statistics of Japan between March 2010 and March 2012 were used. Pregnant women who experienced the earthquake were categorized according to their gestational period as of March 11, 2011, as follows: gestational weeks 4-11, 12-19, 20-27, and 28-36 (2011 group). Similarly, pregnant women who did not experience the earthquake were categorized according to their gestational period as of March 11, 2010 and used as controls (2010 group). We also categorized prefectures as "extremely affected", "moderately affected", and "slightly or unaffected" regions. SSR, birth weight, and gestational period were compared between both groups. Results: The number of singleton births was 688 479 in the 2010 group and 679 131 in the 2011 group. In the extremely affected region, the SSR among women at 4-11 weeks of gestation was significantly lower in the 2011 group compared with the 2010 group (49.8% vs 52.1%, P = 0.009). In the extremely affected region, children born to women who experienced the earthquake at 28-36 weeks of gestation had significantly lower birth weights. Conclusions: The SSR declined among women who experienced the earthquake during early pregnancy, particularly in the extremely affected region. However, no apparent negative effect of the earthquake on perinatal outcomes was observed, although birth weight of infants who were born to women who experienced the earthquake at 28-36 weeks of gestation were lower.

UR - http://www.scopus.com/inward/record.url?scp=84959273949&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84959273949&partnerID=8YFLogxK

U2 - 10.2188/jea.JE20150055

DO - 10.2188/jea.JE20150055

M3 - Article

VL - 26

SP - 76

EP - 83

JO - Journal of Epidemiology

JF - Journal of Epidemiology

SN - 0917-5040

IS - 2

ER -