The Assigned protection factor of 10 for half-mask respirators

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      <subfield code="a">The Assigned protection factor of 10 for half-mask respirators</subfield>
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      <subfield code="a">A number of researchers have published or presented papers on workplace protection factor (WPF) studies involving half-mask respirators. Individually, each study contains a relatively small amount of data, generally less than 25 data points for any single respirator. Because of the small amount of data, any attempt to quantify the result statistically does not provide useful information on the low end of the distribution of WPFs. Several studies on half-mask respirators were combined to yield a data set with 390 observations</subfield>
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      <subfield code="g">Vol. 56, nº 7, July 1995 ; p. 717-724</subfield>
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