Table 1.
Mean, median, and quantiles of reported contacts per day by contact location, type, demographic group, and serostatus for a probability sample of 3112 households representing the population aged ≥ 18 years, United States, 2020–2021.
| Baseline |
Follow-up |
Sample |
Weighted Sample |
Statistical tests ** |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Characteristic | Mean contacts | Median contacts | (25th, 75th, 90th percentiles) | Mean contacts | Median contacts | (25th, 75th, 90th percentiles) | N | % (column) | N | % (column) | T-test p-value *** | K-S test p-value *** |
| Overall | 13.9 | 4.0 | 2.0, 10.0, 27.0 | 14.5 | 5.0 | 2.0, 11.0, 26.0 | 3112 | 100 | 252117112 | 100 | 0.552 | 0.180 |
| Nature of contact | ||||||||||||
| Physical | 5.9 | 4.0 | 1.0, 4.0, 10.0 | 7.8 | 2.0 | 0.0, 5.0, 10.0 | – | – | – | – | 0.322 | 0.654 |
| Non-physical | 10.2 | 2.0 | 0.0, 5.0, 16.0 | 9.6 | 2.0 | 0.0, 6.0, 15.0 | – | – | – | – | 0.722 | 0.685 |
| Contact Location | ||||||||||||
| Home | 2.7 | 1.0 | 0.0, 3.0, 5.0 | 3.7 | 2.0 | 1.0, 3.0, 5.0 | – | – | – | – | 0.410 | 0.596 |
| Work | 10.4 | 0.0 | 0.0, 1.0, 16.0 | 9.4 | 0.0 | 0.0, 2.0, 15.0 | – | – | – | – | 0.568 | 0.993 |
| School | 0.2 | 0.0 | 0.0, 0.0, 0.0 | 0.6 | 0.0 | 0.0, 0.0, 0.0 | – | – | – | – | 0.243 | 1.000 |
| Other | 2.7 | 0.0 | 0.0, 2.0, 6.0 | 3.8 | 0.0 | 0.0, 2.8, 7.0 | – | – | – | – | 0.674 | 1.000 |
| Age category | ||||||||||||
| 18–24 | 20.9 | 5.0 | 3, 20, 60 | 17.7 | 7.0 | 3, 16, 62 | 169 | 5.4 | 24823133 | 9.8 | 0.461 | 0.768 |
| 25–34 | 16 | 6.0 | 3, 13, 35 | 23.3 | 7.0 | 3, 14, 40 | 448 | 14.4 | 42037821 | 16.7 | 0.030 | 1.000 |
| 35–44 | 18.3 | 5.0 | 3, 13, 35 | 14.5 | 6.0 | 3, 14, 23 | 503 | 16.2 | 43010914 | 17.1 | 0.097 | 1.000 |
| 45–54 | 17.7 | 5.0 | 2, 11, 32 | 16.8 | 5.0 | 2, 12, 29 | 509 | 16.4 | 41649386 | 16.5 | 0.796 | 1.000 |
| 55–64 | 10.7 | 3.0 | 1, 7, 26 | 12.7 | 4.0 | 1, 10, 20 | 649 | 20.9 | 44192201 | 17.5 | 0.283 | 0.999 |
| 65 + | 5.5 | 2.0 | 1, 5, 10 | 6.0 | 2.0 | 1, 6, 12 | 834 | 26.8 | 56403657 | 22.4 | 0.592 | 1.000 |
| Sex | ||||||||||||
| Female | 12.5 | 4.0 | 2, 9, 26 | 11.3 | 5.0 | 2, 10, 20 | 1907 | 61.3 | 115127131 | 45.7 | 0.158 | 0.576 |
| 15 | 4.0 | 2, 10, 32 | 17.2 | 5.0 | 2, 12, 32 | 1205 | 38.7 | 136989980 | 54.3 | 0.251 | 1.000 | |
| Race/Ethnicity | ||||||||||||
| Hispanic | 11.8 | 4.0 | 2, 12, 34 | 14.8 | 6.0 | 2, 13, 31 | 388 | 12.5 | 41498755 | 16.5 | 0.242 | 0.931 |
| Non-Hispanic White | 14.3 | 4.0 | 2, 9, 26 | 14.0 | 5.0 | 2, 11, 23 | 2118 | 68.1 | 161730015 | 64.1 | 0.796 | 1.000 |
| Non-Hispanic Black | 16.1 | 3.0 | 1, 10, 40 | 15.5 | 3.0 | 1, 9, 42 | 409 | 13.1 | 26371146 | 10.5 | 0.846 | 1.000 |
| Non-Hispanic Asian | 6.8 | 3.0 | 2, 7, 19 | 11.3 | 5.0 | 2, 9, 26 | 145 | 4.7 | 16297586 | 6.5 | 0.019 | 0.626 |
| Non-Hispanic Other | 25.5 | 6.0 | 1, 13, 40 | 28.2 | 6.0 | 2, 21, 208 | 52 | 1.7 | 6219608 | 2.5 | 0.838 | 0.999 |
| Income | ||||||||||||
| $0 to $9,999 | 9.9 | 4.0 | 2, 6, 23 | 14.1 | 5.0 | 1, 10, 54 | 156 | 5.0 | 9175348 | 3.6 | 0.235 | 0.624 |
| $10,000 to $24,999 | 28.9 | 4.0 | 1, 9, 71 | 19.2 | 4.0 | 1, 10, 31 | 282 | 9.1 | 21014175 | 8.3 | 0.102 | 1.000 |
| $25,000 to $49,999 | 16.7 | 4.0 | 1, 12, 39 | 24.5 | 5.0 | 2, 14, 43 | 594 | 19.1 | 42517322 | 16.9 | 0.020 | 0.998 |
| $50,000 to $74,999 | 9.8 | 4.0 | 2, 9, 21 | 12.1 | 5.0 | 2, 11, 20 | 540 | 17.4 | 40975725 | 16.3 | 0.214 | 1.000 |
| $75,000 to $99,999 | 14 | 4.0 | 2, 10, 35 | 12.9 | 4.0 | 2, 9, 24 | 454 | 14.6 | 34753959 | 13.8 | 0.614 | 1.000 |
| $100,000 to $149,999 | 12.9 | 4.0 | 2, 10, 32 | 9.2 | 4.0 | 2, 9, 17 | 534 | 17.2 | 44554817 | 17.7 | 0.009 | 1.000 |
| $150,000 to $199,999 | 12.2 | 4.0 | 2, 9, 26 | 11.8 | 4.0 | 2, 11, 30 | 246 | 7.9 | 25854439 | 10.3 | 0.871 | 1.000 |
| $200,000 or higher | 9.5 | 4.0 | 2, 9, 22 | 12.4 | 6.0 | 2, 12, 22 | 306 | 9.8 | 33271326 | 13.2 | 0.150 | 0.943 |
| Occupation* | ||||||||||||
| Utilities | 1.3 | 0.0 | 0, 0, 4 | 10.1 | 0.0 | 0, 0, 75 | 16 | 0.5 | 1624138 | 0.6 | 0.205 | 1.000 |
| Construction | 8.5 | 5.0 | 0, 16, 26 | 5.9 | 3.0 | 1, 10, 15 | 50 | 1.6 | 7468477 | 3.0 | 0.166 | 0.905 |
| Manufacturing | 4.4 | 2.0 | 0, 8, 15 | 12.3 | 0.0 | 0, 6, 30 | 50 | 1.6 | 8095010 | 3.2 | 0.085 | 0.982 |
| Retail Trade | 92 | 12.0 | 0, 65, 171 | 72.1 | 4.0 | 0, 30, 142 | 84 | 2.7 | 12398395 | 4.9 | 0.638 | 0.690 |
| Transportation and Warehousing | 24.3 | 6.0 | 0, 26, 85 | 3.2 | 0.0 | 0, 4, 10 | 57 | 1.8 | 4028061 | 1.6 | 0.000 | 0.446 |
| Information | 0.8 | 0.0 | 0, 0, 2 | 0.8 | 0.0 | 0, 0, 4 | 55 | 1.8 | 4702720 | 1.9 | 0.926 | 1.000 |
| Finance and Insurance | 1.7 | 0.0 | 0, 0, 10 | 2.2 | 0.0 | 0, 0, 6 | 105 | 3.4 | 9429022 | 3.7 | 0.520 | 1.000 |
| Real Estate and Rental and Leasing | 1.5 | 0.0 | 0, 3, 8 | 1.9 | 0.0 | 0, 5, 6 | 29 | 0.9 | 2407083 | 1.0 | 0.635 | 1.000 |
| Professional, Scientific, and Technical Services | 1.5 | 0.0 | 0, 0, 5 | 2.1 | 0.0 | 0, 0, 6 | 254 | 8.2 | 17627427 | 7.0 | 0.327 | 1.000 |
| Management of Companies and Enterprises | 4 | 0.0 | 0, 0, 26 | 8.0 | 0.0 | 0, 0, 30 | 29 | 0.9 | 2279303 | 0.9 | 0.672 | 1.000 |
| Administrative Services | 4 | 0.0 | 0, 3, 15 | 2.1 | 0.0 | 0, 2, 7 | 25 | 0.8 | 1804659 | 0.7 | 0.380 | 1.000 |
| Educational Services | 8.5 | 0.0 | 0, 10, 20 | 12.2 | 0.0 | 0, 11, 30 | 227 | 7.3 | 11316238 | 4.5 | 0.160 | 1.000 |
| Health Care and Social Assistance | 16.4 | 2.0 | 0, 17, 46 | 10.0 | 2.0 | 0, 12, 29 | 313 | 10.1 | 24401663 | 9.7 | 0.003 | 1.000 |
| Arts, Entertainment, and Recreation | 4.7 | 0.0 | 0, 0, 10 | 3.6 | 0.0 | 0, 0, 5 | 50 | 1.6 | 3116292 | 1.2 | 0.717 | 1.000 |
| Accommodation and Food Services | 29.3 | 0.0 | 0, 10, 49 | 18.1 | 6.0 | 0, 26, 90 | 55 | 1.8 | 7428078 | 2.9 | 0.943 | 1.000 |
| Other Services (except Public Administration) | 10.4 | 0.0 | 0, 5, 10 | 4.2 | 0.0 | 0, 6, 13 | 75 | 2.4 | 6013537 | 2.4 | 0.292 | 1.000 |
| Public Administration | 3.7 | 0.0 | 0, 7, 12 | 2.3 | 0.0 | 0, 2, 9 | 37 | 1.2 | 2938101 | 1.2 | 0.326 | 1.000 |
| Other | 12.7 | 0.0 | 0, 3, 10 | 14.9 | 0.0 | 0, 5, 17 | 250 | 8.0 | 19646552 | 7.8 | 0.731 | 1.000 |
| Household size | ||||||||||||
| 1 | 6.8 | 2.0 | 0, 5, 12 | 8.7 | 2.0 | 0, 8, 19 | 850 | 27.3 | 40909934 | 16.2 | 0.104 | 0.956 |
| 2 | 11.5 | 3.0 | 1, 8, 23 | 12.0 | 3.0 | 1, 8, 21 | 1228 | 39.5 | 104424631 | 41.4 | 0.722 | 1.000 |
| 3 | 14.9 | 5.0 | 2, 12, 32 | 14.4 | 7.0 | 3, 14, 28 | 448 | 14.4 | 42787020 | 17.0 | 0.817 | 0.958 |
| 4 | 20.3 | 6.0 | 3, 14, 42 | 18.2 | 7.0 | 3, 14, 28 | 383 | 12.3 | 39212704 | 15.6 | 0.466 | 0.999 |
| 5 + | 23.6 | 7.0 | 4, 21, 40 | 28.7 | 7.0 | 3, 14, 39 | 203 | 6.5 | 24782822 | 9.8 | 0.464 | 1.000 |
| ` | ||||||||||||
| Serostatus at baseline (August-December 2020) | ||||||||||||
| Positive | 16.6 | 6.0 | 3, 36, 44 | – | – | 138 | 0.0 | 12316038 | 4.9 | – | – | |
| Negative | 13.3 | 4.0 | 2, 9, 26 | – | – | 2974 | 1.0 | 239801073 | 95.1 | – | – | |
| Serostatus at follow-up (March-April 2021) | ||||||||||||
| Positive | – | – | 19.6 | 8.0 | 3, 14, 31 | 350 | 0.1 | 31360651 | 12.4 | – | – | |
| Negative | – | – | 13.7 | 4.0 | 2, 10, 25 | 2762 | 0.9 | 220756460 | 87.6 | – | – | |
* work, not total, contacts
** Statistical tests performed on weighted data
*** The t-test is sensitive to differences in means of the distributions; the K-S test is sensitive to shape of the distribution.
N, total participants. Weighted N: sum of the weights of participants. K-S: Kolmogorov-Smirnov.