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. 2020 Sep 21;133:104997. doi: 10.1016/j.ssci.2020.104997

Table 2.

Number of observations and types of masks.

Subjects observed in12 days (from 9 am to 8 pm): 1034
Subjects without any mask: 12
Subjects wearing mask (any type):1022
Subjects wearing surgical mask: 622
Subjects wearing FFP2/FFP3 mask (no valve): 118
Subjects wearing FFP2/FFP3 mask (with valve): 129
Subjects wearing diy mask or replaced by cloth: 153