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Facemask against viral respiratory infections among Hajj pilgrims: A challenging cluster-randomized trial

Fig 2

Proportion of facemask using participants by the duration of mask use across the study arms.

(This stacked bar chart shows the proportion by subgroup of recorded time of daily facemask use in the intervention group was consistently greater than in the control group).

Fig 2

doi: https://doi.org/10.1371/journal.pone.0240287.g002