Ann Intern Med. 2022 Nov 29 : M22-1966. Medical Masks Versus N95 Respirators for Preventing COVID-19 Among Health Care Workers COVID-19患者に対して日常的にケアを行う医療従事者において,サージカルマスクはN95と比較してHRが2倍になることを否定するものであった. 佐賀大学医学部附属病院総合診療部
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Figure 1. ITT = intention-to-treat; mRNA = messenger RNA.
* Dates of follow-up: Canada (May 2020 to May 2021), Israel (November 2020 to January 2021), Pakistan (June 2021 to December 2021), and Egypt (December 2021 to March 2022).
Figure 2. Forest plot of the primary intention-to-treat analysis of RT-PCR–confirmed COVID-19. There were 86 of 8338 (1%) weekly surveys missing in the medical mask group and 65 of 8468 (0.8%) missing in the N95 respirator group. The subgroup analysis by country was added to show the heterogeneity of treatment effect. HR = hazard ratio; RT-PCR = reverse transcriptase polymerase chain reaction. 医療用マスク群では 8338 件中 86 件(1%)の週間調査の欠落があり、N95 レスピレーター群では 8468 件中 65 件(0.8%)の欠落があった。治療効果の異質性を示すために国別のサブグループ解析を追加した。HR = ハザード比; RT-PCR = 逆転写酵素ポリメラーゼ連鎖反応。 The proportional hazards assumption was tested for the primary outcome and was plausible.