James Derrick
About James Derrick
Role(s) / Profession(s)
- Physician
Organization
- Chinese University of Hong Kong
Language(s)
- English
Recent Contributions
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James Derrick replied to "How much better is respirator fit testing compared with fit checking?" in the TB Infection Control community.
From our results (Predictive value of the user seal check in determining half-face respirator fit) I calculate: Sensitivity 77% Specificity 64% PPV 0.83 NPV 0.56 The three respirators in our study were chosen because they were the most likely to fit our population (Chinese). Most of the respirators we tested, however, had pass rates of 10% or less. One popular respirator did not work even when it was stuck to the face of our subjects ...
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James Derrick replied to "How much better is respirator fit testing compared with fit checking?" in the TB Infection Control community.
Yes unfortunately the powered respirators are much more expensive. We were informed by 3M in Hong Kong that the 9320 is the same respirator as the 9210, packaged for a different market. We used a different fit test method to Dr Volchenkov, so I would not want to be too dogmatic, but the difference between our results and his are certainly suggestive that there may be marked ethnic differences in fit rate between respirator models. ...
Recent Recommendations
- None at this time.