Department of Anaesthesia and Pain Management, Royal Melbourne Hospital, Parkville, Australia.
University of Melbourne, Parkville, Victoria, Australia.
Infect Control Hosp Epidemiol. 2023 Feb;44(2):291-294. doi: 10.1017/ice.2022.67. Epub 2022 Apr 7.
Some manufacturers provide information on similar-fit model pairings of filtering facepiece respirators (FFRs), suggesting that fit-test outcome of one model helps predict the other. This guidance may be useful during crisis capacity when FFR supplies and/or fit tests are constrained. The purpose of this study was to compare quantitative fit-test (QNFT) results and concordance between a pair of similar-fit 3M Aura FFRs: the 3M 9320A+ and 3M 1870+.
All participants completed online training and a QNFT with both respirators. The order of the respirator being examined first was randomly allocated. The outcomes included QNFT pass rate, concordance between the 2 models, overall and individual fit factors, and percentage of male and female participants who passed or failed the QNFT.
We recruited 1,000 participants (668 females and 332 males). The QNFT pass rate, overall fit factors, and individual fit factors were significantly higher for the 3M 9320A+ than the 3M 1870+ FFR. The concordance between the models was "fair" (κ coefficient, 0.38). Male participants who passed a QNFT with either of the FFRs had 96% chance of passing the QNFT for the alternate model. Female participants who passed the 3M 1870+ had 97% chance of passing the QNFT for the 3M 9320A+ model. However, ∼1 in 12 females who passed the QNFT for the 3M 9320A+ failed the QNFT for the 3M 1870+ FFR.
Similar-fit paired FFR models may provide a consequentially different level of respiratory protection, especially for women. Our findings are important for FFR stockpiling and fit-testing strategies, especially during crisis capacity.
一些制造商提供了过滤式口罩（FFR）类似适配模型配对的信息，表明一种模型的拟合测试结果有助于预测另一种模型。在 FFR 供应和/或适配测试受到限制的危机能力期间，此指导可能会很有用。本研究的目的是比较两款类似适配的 3M Aura FFR（3M 9320A+和 3M 1870+）的定量适配测试（QNFT）结果和一致性。
所有参与者都完成了在线培训和两种口罩的 QNFT。检查第一种口罩的顺序是随机分配的。结果包括 QNFT 通过率、两种模型之间的一致性、总体和个体适配因子，以及通过或未通过 QNFT 的男性和女性参与者的百分比。
我们招募了 1000 名参与者（668 名女性和 332 名男性）。3M 9320A+的 QNFT 通过率、总体适配因子和个体适配因子均显著高于 3M 1870+FFR。两种模型之间的一致性为“中等”（κ系数，0.38）。通过任何一种 FFR 的 QNFT 的男性参与者有 96%的机会通过另一款模型的 QNFT。通过 3M 1870+的 QNFT 的女性参与者有 97%的机会通过 3M 9320A+模型的 QNFT。然而，约 1/12 通过 3M 9320A+的 QNFT 的女性参与者未能通过 3M 1870+FFR 的 QNFT。
类似适配的配对 FFR 模型可能提供不同程度的呼吸保护，尤其是对女性而言。我们的发现对于 FFR 库存和适配测试策略很重要，尤其是在危机能力期间。
