生まれた時の体温と性別比率は,
Jasmin Abdel Ghany1,2, Joshua Wilde1,2,3,4,5, Anna Dimitrova6
1Nuffield College, University of Oxford, Oxford OX1 1NF, United Kingdom.
まとめ
妊娠中の極端な熱への曝露は,出生時のヒトの性別比率 (SRBs) に著しく影響を与えます. 温度の上昇は,サハラ以南のアフリカで spontaneous abortionsが増加し,インドで sex-selective abortionsが減少しているとの関連がある.
科学分野:
- 環境衛生 環境衛生 環境衛生
- 生殖伝染病学 生殖伝染病学
- デモグラフィー デモグラフィー 人口統計
背景:
- ヒトの出生時の性別比率は,人口動態に影響を与え,母親の健康と社会的ジェンダーバイアスを反映しています.
- 極端な熱への産前暴露は,SRBに影響を与える可能性がある潜在的な環境ストレス因子ですが,経験的証拠は稀です.
研究 の 目的:
- サハラ以南のアフリカとインドで,産前熱曝露と出生時の性別比率の関連性を調査する.
- 社会人口学的要因と息子の好みの地域的変動を用いて,気温の影響による自発的妊娠中絶と性選択的妊娠中絶を区別する.
主な方法:
- サハラ以南のアフリカ33カ国とインドの500万人の生児の調査データを分析した.
- 出生データを高解像度温度データとリンクして,産前熱被曝を評価する.
- 社会人口学的差異,被曝のタイミング,地域的な息子の好みを活用して,中絶の種類を区別する.
主要な成果:
- 20°C以上の最大気温は,両地域における男性出産とマイナスの関連があった.
- サハラ以南のアフリカでは,最初の3ヶ月間の熱への曝露は,少数の男性出産と相関しており,特に脆弱な母集団の間で,自発的中絶の増加を示唆しています.
- インドでは,第2 trimesterの熱への曝露は,少数の男性出産と関連しており,特に高次元の出産と,強い息子の好みのある地域の母親の間で,性別選択的中絶の減少と一致しています.
結論:
- 産前熱曝露は,母親の健康に悪影響を及ぼし,産前死亡率を高め,家族計画行動に影響を与えます.
- 自発的妊娠中絶や性選択性妊娠中絶の温度による変化は,出生時にヒトの性別比率に複雑な変化をもたらします.
- 環境の熱は,生殖の結果と人口の性別組成に影響を与える重要な要因です.
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