Reproducibility of Respirator Fit as Measured by Quantitative Fitting Tests

Roza, R.A. da; Cadena-Fix, C.A.; Carlson, G.J.; Hardis, K.E.; Held, Bruce

doi:10.1202/0002-8894(1983)044<0788:rorfam>2.3.co;2

Cited by 2 publications

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“…(10) Similar results have been found in other research associated with re-useable halfmask respirators. (11–13) da Roza et al found reproducibility is more easily achieved when tests are given on the same day than when fit tests are conducted on different days. (11) …”

Section: Discussionmentioning

confidence: 99%

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Inward Leakage Variability between Respirator Fit Test Panels – Part I. Deterministic Approach

Zhuang

Liu

Coffey

et al. 2015

Journal of Occupational and Environmental Hygiene

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Inter-panel variability has never been investigated. The objective of this study was to determine the variability between different anthropometric panels used to determine the inward leakage (IL) of N95 filtering facepiece respirators (FFRs) and elastomeric half-mask respirators (EHRs). A total of 144 subjects, who were both experienced and non-experienced N95 FFR users, were recruited. Five N95 FFRs and five N95 EHRs were randomly selected from among those models tested previously in our laboratory. The PortaCount Pro+ (without N95-Companion) was used to measure IL of the ambient particles with a detectable size range of 0.02 to 1 μm. The Occupational Safety and Health Administration standard fit test exercises were used for this study. IL test were performed for each subject using each of the 10 respirators. Each respirator/subject combination was tested in duplicate, resulting in a total 20 IL tests for each subject. Three 35-member panels were randomly selected without replacement from the 144 study subjects stratified by the National Institute for Occupational Safety and Health bivariate panel cell for conducting statistical analyses. The geometric mean (GM) IL values for all 10 studied respirators were not significantly different among the three randomly selected 35-member panels. Passing rate was not significantly different among the three panels for all respirators combined or by each model. This was true for all IL pass/fail levels of 1%, 2%, and 5%. Using 26 or more subjects to pass the IL test, all three panels had consistent passing/failing results for pass/fail levels of 1% and 5%. Some disagreement was observed for the 2% pass/fail level. Inter-panel variability exists, but it is small relative to the other sources of variation in fit testing data. The concern about inter-panel variability and other types of variability can be alleviated by properly selecting: pass/fail level (IL 1–5%); panel size (e.g., 25 or 35); and minimum number of subjects required to pass (e.g., 26 of 35 or 23 of 35).

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Section: Discussionmentioning

confidence: 99%

“…(11–13) da Roza et al found reproducibility is more easily achieved when tests are given on the same day than when fit tests are conducted on different days. (11) …”

Section: Discussionmentioning

confidence: 99%

Inward Leakage Variability between Respirator Fit Test Panels – Part I. Deterministic Approach

Zhuang

Liu

Coffey

et al. 2015

Journal of Occupational and Environmental Hygiene

View full text Add to dashboard Cite

show abstract

“…1. The data of WPF and FF showed an approximate straight line indicating that lognormal statistics will give good estimates of mean and variability 21,22) . The WPFs measured on all the samples of the three respirator brands were found to range 2.2 to 132.9 with GM of 15.9 and GSD of 2.63.…”

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confidence: 99%

Correlations between Workplace Protection Factors and Fit Factors for Filtering Facepieces in the Welding Workplace.

Han

2002

INDUSTRIAL HEALTH

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Reproducibility of Respirator Fit as Measured by Quantitative Fitting Tests

Cited by 2 publications

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Inward Leakage Variability between Respirator Fit Test Panels – Part I. Deterministic Approach

Inward Leakage Variability between Respirator Fit Test Panels – Part I. Deterministic Approach

Correlations between Workplace Protection Factors and Fit Factors for Filtering Facepieces in the Welding Workplace.

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