Trial reportJournal of Korean medical science2021
Respiratory Protection Effect of Ear-loop-type KF94 Masks according to the Wearing Method in COVID-19 Pandemic: a Randomized, Open-label Study.
Trial report in Journal of Korean medical science, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04794556 (Respiratory Protection Effect of Ear-loop-type KF94 Filtering Facepiece Respirators According to the Wearing Method), which is not on this map. Cited by 4 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Respiratory Protection Effect of Ear-loop-type KF94 Filtering Facepiece Respirators According to the Wearing Method: A Randomized, Open-label Study
Who cites it
4 citing papers in PubMed, 1 synthesis or guideline pooled it, 11 citations in OpenAlex.
- A systematic review of fit improvement strategies for respirators: lessons learned from the COVID-19 pandemic.BMC public health · 2025Pooled it
- Overview of tight fit and infection prevention benefits of respirators (filtering face pieces).The Journal of hospital infection · 2023Review
- COVID-19 Outbreak in Daegu City, Korea and Response to COVID-19: How Have We Dealt and What Are the Lessons?Journal of Korean medical science · 2022Review
- A comparison of conventional and advanced electroanalytical methods to detect SARS-CoV-2 virus: A concise review.Chemosphere · 2022Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
11 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundEar-loop-type Korean Filter 94 masks (KF94 masks, equivalent to the N95 and FFP2) are broadly used in health care settings in Korea for the coronavirus disease 2019 pandemic.
methodsA prospective randomized open-label study was designed to identify differences in the fitting performance between mask wearing methods in three different types of KF94 mask with ear loops between January to March 2021. General-fitting involved wearing an ear-loop-type KF94 mask, and tight-fitting involved wearing a mask aided by a clip connecting the ear loops. Each of the 30 participants wore three types of masks according to a randomly assigned order in both methods and performed a total of six quantitative fit tests (QNFTs) according to the occupational safety and health administration protocol.
resultsAll fit factors (FFs) measured by the QNFT were significantly higher for tight-fitting method with the clip in all KF94 masks (
conclusionEven with sufficient filter efficiency, ear-loop-type-KF94 masks do not provide adequate protection. However, in relatively low-risk environments, wearing a face-seal adjustable KF94 mask and tight wearing with a clip can improve respiratory protection for healthcare workers.
trial registrationClinicalTrials.gov Identifier: NCT04794556.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.