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The Adequate protection rate (A) and fit factor (B) for the 3 respirators during the baseline and chest compression phases. The protective performance of the fold-type respirator did not decrease during the chest compressions. The adequate protection rates and fit factors of the cup-type and valve-type respirators decreased during the chest compressions. Cup-type: 3 M 1860, fold-type: 3 M 1870, valve-type: 3 M 9332.
