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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: Eur J Cancer Prev. 2019 May;28(3):225–233. doi: 10.1097/CEJ.0000000000000460
fresp_type is the type of respirator used
fFreq_G is the frequency of respirator use
fMaint_R is the frequency of respirator replacement
fMaint_C is the frequency of respirator maintenance (cartridge replacement)
fMaint_Clean is the frequency of respirator cleaning
fseal is the frequency of respirator seal cleaning