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Openai/69716778-c854-8005-8bde-90ffbbce5a8b
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===== 1. モデルの仮定や計算方法が異なる - 例：感染率の推定、ワクチン効果（重症化・死亡防止）の想定、感染後の免疫の影響などが研究ごとに異なるため。JAMA Network<ref>{{cite web|title=JAMA Network|url=https://jamanetwork.com/journals/jama-health-forum/fullarticle/2836434|publisher=JAMA Network|access-date=2026-01-22}}</ref> ===== # 期間の違い - 初年度だけ測る研究と、2020〜2024年全期間を測る研究では前提が違う。Covid Vaccine Research Hub<ref>{{cite web|title=Covid Vaccine Research Hub|url=https://www.covidvaccineresearch.org/news/covid-19-vaccines-prevented-20-million-deaths-worldwide-first-year-estimates-imperial|publisher=Covid Vaccine Research Hub|access-date=2026-01-22}}</ref>
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