## 3 Results
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \multicolumn{5}{c}{**The Mask Filter**} \\ \hline \multicolumn{5}{c}{15. How easy is it to achieve a comfortable fit of the Mask Fitter on your face?} \\ \hline Very low & Low & Medium & High & Very high \\ \hline
2 (10\%) & 1 (5\%) & 5 (25\%) & 7 (35\%) & 5 (25\%) \\ \hline \multicolumn{5}{c}{16. Over short-term use (up to one hour) how comfortable is your Mask Fitter?} \\ \hline Very low & Low & Medium & High & Very high \\ \hline
2 (10\%) & 2 (10\%) & 6 (30\%) & 6 (30\%) & 4 (20\%) \\ \hline \multicolumn{5}{c}{17. Over mid-term use (up to four hours) how comfortable is your Mask Fitter?} \\ \hline Very low & Low & Medium & High & Very high \\ \hline
2 (10\%) & 5 (25\%) & 8 (40\%) & 6 (30\%) & 2 (10\%) \\ \hline \multicolumn{5}{c}{18. Over long-term use (up to eight hours) how comfortable is your Mask Fitter?} \\ \hline Very low & Low & Medium & High & Very high \\ \hline
5 (25\%) & 8 (40\%) & 5 (25\%) & 2 (10\%) & 0 (0\%) \\ \hline \multicolumn{5}{c}{19. How confident are you that you have achieved an effective seal with the Mask Fitter?} \\ \hline Very low & Low & Medium & High & Very high \\ \hline
0 (0\%) & 1 (5\%) & 1 (5\%) & 3 (15\%) & 15 (75\%) \\ \hline \multicolumn{5}{c}{20. How would you rate the cleaning procedure for the Mask Fitter?} \\ \hline Very difficult & Difficult & Medium & Easy & Very easy \\ \hline
0 (0\%) & 0 (0\%) & 1 (5\%) & 4 (20\%) & 15 (75\%) \\ \hline \multicolumn{5}{c}{21. Would you routinely use the Mask Fitter to improve the FFP2 seal?} \\ \hline Yes & Only for selected patients & Only for selected procedures & For both selected patients and procedures & No \\ \hline
5 (25\%) & 0 (0\%) & 3 (15\%) & 10 (50\%) & 2 (10\%) \\ \hline \end{tabular}
\end{table} 
Table 4: **Section 4**: The Mask Fitter. \begin{table}
\begin{tabular}{c c} \hline \hline \multicolumn{3}{c}{**Fogging**} \\ \hline \multicolumn{3}{c}{23. Do you wear loupes?} \\ \hline Yes & No \\ \hline
3 (15\%) & 17 (85\%) \\ \hline \multicolumn{3}{c}{24. Do you wear glasses?} \\ \hline Yes & No \\ \hline
13 (65\%) & 7 (35\%) \\ \hline \multicolumn{3}{c}{25. Is loupes or glasses fogging a problem when wearing FFP2 without Mask Fitter? (only for those answering yes to either question 22 or 23)} \\ \hline Very low & Low & Medium & High & Very high \\ \hline
1 (6.7\%) & 3 (20\%) & 4 (26.7\%) & 5 (33.3\%) & 2 (13.3\%) \\ \hline \multicolumn{3}{c}{26. Is loupes or glasses fogging a problem when wearing FFP2 with the Mask Fitter? (only for those answering yes to either question 22 or 23)} \\ \hline Very low & Low & Medium & High & Very high \\ \hline
6 (40\%) & 5 (33.3\%) & 3 (20\%) & 0 (0\%) & 1 (6.7\%) \\ \hline \hline \end{tabular}
\end{table} 
Table 5: **Section 5**: Fogging. For both selected patients and procedures  
Wearing all the time is heavy but for selected procedures and patients it is fine. Breathing is anyway more difficult and without it, thus I would say that selected patients and procedures would be better. Positive comments  
Better seal and no fogging on screen even when used for a long time. I have a thin face and all the masks (with the only exception of 3 M Aura which is a FFP3) have sealing problems. Better seal thus better protection. A final overall comment was posed to the participants  
27. Any other comments that you have regarding face masks or Mask Fitter  
12 responses which centred on pressure on the nose. Nose is a little compressed. Easier to fit than the other protections. Nose is a problem because my glasses and my screen go on the nose, thus the position of the filter (on the nose) is not \"free\" and gives some pain after hours of use. The fitting is never perfect. Without elastic bands it creates problems for the ears. With the elastic bands it creates problems to the nose and chin.