Fig 7. Background-corrected particle counts comparing facemask treatments within the enclosed box.

Measurements shown for the six particle size bins are shaded and grouped by the measurement position (Front—Green, Left; Side—Yellow, Middle; Top—Blue, Right). Row 1 includes No Mask, Sewn, SewnF, SewnPC. Row 2 includes more advanced and commercially available facemask treatments (Surgical, N95L, and N95T masks). Gray bullet points at the baseline indicate negative corrected counts. Error bars indicate the sample standard deviation for particle counts in each of the respective particle size bins from three independent measurements. A 2-factor MANOVA and subsequent 2-factor ANOVAs were performed in addition to Tukey's Honest Significant Difference tests; p-values, relevant parameters, and analysis are shown as interactive maps and graphs included in S2 File.