Table 2 Receiver operating characteristic (ROC) analysis.

From: Bacterial and fungal isolation from face masks under the COVID-19 pandemic

Factor

Variable

AUC

Association

Mask type, non-woven

Outer-side fungal count

0·77

Negative*

Gender, female

Face-side bacterial count

0·71

Negative†

Usage \(\geqq\) 2 days

Outer-side fungal count

0·65

Positive*

Gender, female

Cladosporium positive

0·65

Positive

B. subtilis, inside

White medium colony

0·65

Negative

Natto\(\geqq\) once/month

Bacillus subtilis

0·61

Positive

Public transportation

Bacterial or fungal count

0·50

No

B. subtilis, inside

Staphylococcus epidermidis

0·42

No

  1. Boldface shows AUC higher than 0.6
  2. AUC: 0.5–0.6, unsatisfactory; 0.6–0.7, satisfactory; 0.7–0.8, good; 0.8–0.9, very good; 0.9–1, excellent.
  3. *, Associations were consistent with statistical differences shown in *, Figs. 2; †, S1.