|
KMID : 0895420020120010046
|
|
Journal of Korean Society of Occupational and Enviromental Hygiene
2002 Volume.12 No. 1 p.46 ~ p.54
|
|
|
Development of half-masks well-fitting for Korean faces (1)
|
|
|
|
|
Abstract
|
|
|
|
The purpose of this study was to determine if there is a relationship between facial dimensions and fit of half mask respirator using fit factors and to select good facial dimension predictor(s) of fit before designing well-fitting respirators for Korean workers. Three different brand half mask respirators, A, B and C were fit tested on 112 male and 38 female subjects using TSI Portacount 8020R and fit factors were determined. Before fit testing 10 facial dimensions were measured. Data were analyzed by descriptive statistics, Pearson´s correlation analysis and quadratic polynomial regression analysis with log transformed fit factors (LNFFs). As a result of scatterplot matrix display some of relationships between LNFFs and facial dimensions in brand/gender subgroups were found to be curvilinear rather than linear. Since this result indicated that a multiple polynomial regression model including quadratic terms may be appropriate rather than a multiple linear regression, data were also analyzed by a quadratic term by examination of the coefficient of partial correlation. No common facial dimension variables were found to be significant for brand/gender subgroups but the coefficient of regression for the linear term of bitragion-subnasale arc was significant for male subjects of all three brands respirators and for 5 of 9 brand/gender subgroups. All subjects for mask B had the highest coefficient of determination values (R2=0.41) in brand/gender subgroups. As a result of quadratic term on all subjects for mask B, face width (bizygomatic breath), face length (menton-nasal root length) and nose protrusion were good predictors of half mask fit. In 5 of 9 other different brand/gender subgroups face width was indicated as a good predictor of fit by quadratic term. These results would indicate that face width and bitragion-subnasale arc may be predictor of fit by quadratic term. These results would indicate that face width and bitragion-subnasale arc may be preferentially considered to design a half-mask respirator for Korean workers. But this study also implies that it would not be easy to consider certain facial dimension(s) when designing half mask in Korea because of no common facial dimensions to affect mask fit.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|