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Table 1 Inclusion and Exclusion criteria for participant recruitment

From: The application of a surgical face mask over different oxygen delivery devices; a crossover study of measured end-tidal oxygen concentrations

Inclusion Criteria

Exclusion Criteria

• ASA Physical Status Classification System grade 1 – healthy patient [20]

• Non-smoker

• Age > 18

• Voluntary subject

• Pre-existing lung disease

• Current or ex-smoker

• Any current infective or respiratory symptoms

• Any other significant medical condition requiring treatment with regular medication