Table 2.
Relative risk (RR) of overall risk by nonpharmaceutical interventions to no intervention in the MCT and LCT scenarios.
|
Csaliva (mL−1) |
||||||||
|---|---|---|---|---|---|---|---|---|
| 101 | 102 | 103 | 104 | 105 | 106 | 107 | 108 | |
| MCT scenario | ||||||||
| HCW with a face mask | 0.38 | 0.37 | 0.37 | 0.37 | 0.38 | 0.38 | 0.42 | 0.88 |
| HCW with a face shield | 0.016 | 0.019 | 0.018 | 0.020 | 0.033 | 0.070 | 0.11 | 0.30 |
| HCW with a face mask and shield | 2.8 × 10−4 | 2.7 × 10−4 | 2.8 × 10−4 | 3.1 × 10−4 | 5.9 × 10−4 | 1.6 × 10−3 | 3.6 × 10−3 | 0.019 |
| Patient with a face mask | 8.7 × 10−5 | 8.6 × 10−5 | 8.7 × 10−5 | 9.8 × 10−5 | 1.8 × 10−4 | 4.9 × 10−4 | 1.1 × 10−3 | 6.0 × 10−3 |
| Patient with a face mask and air change rate of 6 h−1 | 3.8 × 10−5 | 3.8 × 10−5 | 3.8 × 10−5 | 4.3 × 10−5 | 8.1 × 10−5 | 2.2 × 10−4 | 4.9 × 10−4 | 2.6 × 10−3 |
| LCT scenario | ||||||||
| HCW with a face mask | 0.36 | 0.36 | 0.36 | 0.37 | 0.40 | 0.59 | 1.0 | 1.0 |
| HCW with a face shield | 0.026 | 0.027 | 0.028 | 0.031 | 0.048 | 0.095 | 0.22 | 0.56 |
| HCW with a face mask and shield | 8.4 × 10−5 | 8.6 × 10−5 | 8.7 × 10−5 | 1.0 × 10−4 | 1.8 × 10−4 | 5.6 × 10−4 | 4.9 × 10−3 | 0.048 |
| Patient with a face mask | 2.8 × 10−5 | 2.8 × 10−5 | 2.9 × 10−5 | 3.3 × 10−5 | 5.9 × 10−5 | 1.9 × 10−4 | 1.6 × 10−3 | 0.016 |
| Patient with a face mask and air change rate of 6 h−1 | 1.0 × 10−5 | 1.1 × 10−5 | 1.1 × 10−5 | 1.2 × 10−5 | 2.2 × 10−5 | 7.0 × 10−5 | 6.1 × 10−4 | 6.1 × 10−3 |
RR to the overall risk of an HCW with no PPE in the MCT scenario using k = 0.00246 for pathways (1) to (4) and k = 0.246 for pathways (5) and (6). Abbreviations: HCW, healthcare worker; LCT, long contact time; MCT, medium contact time; PPE, personal protective equipment; RR, relative risk.