Table 1 Characteristics of single-encounter meetings during which SARS-CoV-2 infection took place according to the origin of the source case (household members excluded) between October 1, 2020, and August 29, 2022
Total (n = 69,788) | Work (n = 12,164) | Family (n = 21,668) | Friends (n = 18,164) | Othera (n = 17,784) | P value | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
N | % | N | % | N | % | N | % | N | % | ||
Symptomatic | < 0.001 | ||||||||||
Yes | 24,529 | 35.1% | 5366 | 44.1% | 8379 | 38.7% | 5070 | 27.9% | 5712 | 32.1% | |
Location of encounter | |||||||||||
Indoors with closed windows | 49,230 | 70.6% | 9323 | 76.6% | 15,323 | 70.7% | 12,512 | 68.9% | 12,072 | 67.9% | |
Indoors with open windows | 14,687 | 21.0% | 2259 | 18.6% | 5081 | 23.4% | 4211 | 23.2% | 3136 | 17 0.6% | |
Outdoors | 5863 | 8.4% | 582 | 4.8% | 1264 | 5.8% | 1441 | 7.9% | 2576 | 14.5% | |
Duration of encounter | < 0.001 | ||||||||||
< 1 min | 6350 | 9.1% | 1528 | 12.6% | 1885 | 8.7% | 1389 | 7.6% | 1548 | 8.7% | |
< 5 min | 8688 | 12.5% | 2073 | 17.0% | 2463 | 11.4% | 1849 | 10.2% | 2303 | 12.9% | |
5–15 min | 9594 | 13.7% | 2140 | 17.6% | 2681 | 12.4% | 2049 | 11.3% | 2724 | 15.3% | |
> 15 min | 35,206 | 50.5% | 4809 | 39.5% | 10,978 | 50.7% | 10,430 | 57.4% | 8988 | 50.5% | |
Unknown | 9943 | 14.2% | 1614 | 13.3% | 3661 | 16.9% | 2447 | 13.5% | 2221 | 12.5% | |
Mask-wearingb | < 0.001 | ||||||||||
Neither wore a mask | 57,330 | 82.2% | 7169 | 58.9% | 19,751 | 91.2% | 17,364 | 95.6% | 13,046 | 73.4% | |
By suspected source of infection only | 2088 | 3.0% | 543 | 4.5% | 598 | 2.7% | 227 | 1.2% | 720 | 4.1% | |
By person infected only | 4223 | 6.0% | 1572 | 12.9% | 601 | 2.8% | 272 | 1.5% | 1778 | 10.0% | |
By both source case and participant | 6139 | 8.8% | 2880 | 23.7% | 718 | 3.3% | 301 | 1.7% | 2240 | 12.6% | |