Respirator fit of a medium mask on a group of South Africans: a cross-sectional study

Spies, Adri; Wilson, Kerry; Ferrie, Robert

doi:10.1186/1476-069x-10-17

Cited by 24 publications

(42 citation statements)

References 14 publications

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“…On the other hand, respirator fit is not specific to gender characteristics. Fit factors did not differ significantly by gender despite significant differences in the facial dimensions in the general South African population 6) .…”

Section: Introductionmentioning

confidence: 73%

The relationship between the filtering facepiece respirator fit and the facial anthropometric dimensions among Chinese people

2020

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S: Taking action in response to anthropometrics is important to respirator fit. We aimed to investigate the associations between the filtering facepiece respirator(FFR) fit and the head-face dimensions among Chinese people. We used data from 85 volunteers. We focused on fit factors and 8 head-facial dimensions of subjects. The fit factors from 4 respirator models with different protection levels and shapes were measured by a PortaCount○ R fit tester. Each subject tested four respirator models, for a total of four quantitative fit tests per subject. Passing rate (PR) of each model was determined at fit factor level no less than 100. The data of 85 subjects aged 22-51 years old were analyzed using Chi-square test, one-way ANOVA test, t-test and non-conditional logistic regression model. The PRs for the 4 models were 52.9%, 61.2%, 40.0% and 63.5%, which were significantly different. We found the positive effect of morphological facial length and negative effect of bitragion-submandibular arc on fit factors. This confirms it is necessary to conduct fit test before using a respirator. PRs varied among 4 models regardless of their protection level and shape. Anthropometric dimension of the user, which had effects on FFR fit, should be considered when designing respirator.

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Section: Introductionmentioning

confidence: 73%

The relationship between the filtering facepiece respirator fit and the facial anthropometric dimensions among Chinese people

2020

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“…It is deemed that masks would fit the population if it fits the members of this panel or the headforms. Spies et al (2011) suggests that respirator fit varies from face to face and not just based on race or gender. The reduction of the gap between the rigid mask and face is suggested in Fenlon (2007) for reducing chances of leakage and that work registered the mask on the face using four specific points on the mask and corresponding landmarks on the face.…”

Section: Summary Of Literaturementioning

confidence: 97%

Deriving statistical fit contours and shape of an aerosol mask from 3D head scans

Krishnamurthy

Sen

2011

IJHFMS

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This paper deals with mask shape design to ensure a statistical fit for a given population represented by tessellated 3D head scans. The mask rim curve should contact the face without gaps. This work identifies corresponding points on the mask and facial landmarks. The landmarks define a coordinate frame which helps extract rim contours (mask contours) and facial midline contours (profile contours) from the 3D model. Bilateral symmetrisation procedures are used to correct mild asymmetry in the mask contours. The statistical distribution induced by the contours on a grid is used to derive percentile contour geometries. Mask shapes generated by stacking elliptic cross sections, scaling and convex hull have been explored. 5th, 50th and 85th percentile masks are used for visual fit evaluation on a set of representative faces. The procedure establishes that the landmark-based approach provides a systematic method not only for design but also for fit evaluation.

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“…International Publisher with respect to its concentration inside the respirator during worn. The key role of the filtering capacity of a mask is related to the ability of the mask to form a seal with the user's face, removing air leakage between the user's face and the contour of the mask (8). Currently, there are several types of fit tests that are able to measure the potential of a face seal mask to the user's face, obtaining the fit factor as a numeric value that indicates the facial fit-ability of these masks (8)(9)(10)(11).…”

Section: Ivyspringmentioning

confidence: 99%

Fit factor of masks used by Physicians in Clinical Settings

De-Yñigo-Mojado¹,

Madera-García²,

Becerro‐de‐Bengoa‐Vallejo³

et al. 2020

Int. J. Med. Sci.

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Background: Usually, physicians use filtering respirators in clinical settings to a lesser extent than other simpler surgical masks. The study aim was to determine the fit factor of surgical and other types masks commonly used in clinical settings compared with FFP3 filtering respirators. Materials and Methods: A cross-sectional study was carried out recruiting a total sample of 78 physicians. Fit factor was measured to determine particles count into masks compared to particles count outside of the masks meanwhile physicians carried out a protocol composed by 8 exercises as well as the global fit factor total scores. First, fit factor was analyzed with the usual surgical masks used by physicians in clinical settings. Second, fit factor was determined with the proposed FFP3 filtering respirators. Results: Most participants (97%) used surgical masks. Statistically significant differences (P<0.001) with an effect size from moderate to large (d=0.61-1.00) were shown for fit factors in the different exercises and total scores between surgical and other masks (3.2±5.0) and FFP3 filtering respirators (40.7±37.8). Generally, FFP3 filtering respirators showed a higher fit factor in the different exercises and total scores compared to the commonly used surgical and other types masks in clinical settings. Conclusions: Despite most physicians used surgical masks in clinical settings, filtering FFP3 masks showed a higher fit factor in the different exercises and total scores compared with the used surgical masks and filtering respirators such as FFP1, FFP2 and other types in clinical settings.

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Respirator fit of a medium mask on a group of South Africans: a cross-sectional study

Cited by 24 publications

References 14 publications

The relationship between the filtering facepiece respirator fit and the facial anthropometric dimensions among Chinese people

The relationship between the filtering facepiece respirator fit and the facial anthropometric dimensions among Chinese people

Deriving statistical fit contours and shape of an aerosol mask from 3D head scans

Fit factor of masks used by Physicians in Clinical Settings

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