Table 1.
Demographic information and participation in COVID-19 case investigation and contact tracing—central Washington State, June 15–July 12, 2020
| Measure | n or mean* | % or range* |
|---|---|---|
| Individuals with COVID-19 referred for case investigation† | 4987 | – |
| Age in years (mean) | 37 | 0–100 |
| Female sex** | 2,454 | 52 |
| Hispanic | 2,751 | 77 |
| Non-Hispanic white | 641 | 18 |
| Other or unknown race/ethnicity | 199 | 6 |
| Spanish preferred | 986 | 27 |
| Employed | 1,942 | 54 |
| Individuals called by an investigator | 4,987 | 100 |
| Individuals interviewed | 3,534 | 71 |
| Individuals unable to be interviewed | 1,453 | 29 |
| Refused | 460 | 9 |
| Non-working phone number | 208 | 4 |
| No answer or response to phone calls | 785 | 16 |
| Individuals later completing the online investigation form‡ | 100 | 2 |
| Individuals with COVID-19 reporting no contacts | 2,441 | 68 |
| Hispanic individuals | 1,870 | 68 |
| Non-Hispanic individuals | 547 | 68 |
| 0–17 years | 307 | 69 |
| 18–22 years | 293 | 68 |
| 23–44 years | 1,098 | 68 |
| 45–64 years | 605 | 71 |
| ≥ 65 years | 138 | 64 |
| Female sex** | 1,184 | 66 |
| Employed | 1,263 | 66 |
| Not currently employed | 1,166 | 71 |
| Health district A | 278 | 75 |
| Health district B | 1,109 | 72 |
| Health district C | 1,054 | 63 |
| Individuals with COVID-19 listing contacts | 968 | 27 |
| Total contacts elicited*** | 2293 | – |
| Age in years (mean) | 28 | 0–87 |
| < 18 years | 825 | 36 |
| Household contact | 1,799 | 79 |
| Mean number of contacts per individual with COVID-19 who listed contacts | 2.4 | 1–16 |
| Mean household contacts per individual | 1.9 | 0–9 |
| Mean non-household contacts per individual | 0.5 | 0–15 |
| Contacts interviewed | 1,941 | 85 |
| Contacts unable to be interviewed | 350 | 15 |
| Refused | 61 | 3 |
| No working phone number available | 101 | 4 |
| No answer or response to phone calls | 188 | 8 |
*Denominators are not consistent due to different data sources (lab reports vs. case investigations and contact interviews) as well as missing data. Due to rounding percentages may not add to 100%
**Information on sex is reported because information on gender was not reliably available
***If multiple individuals with COVID-19 share a household then their shared household contacts will only be listed under one individual, so contact metrics should not contain duplicate household contacts
COVID-19 coronavirus disease 2019
†Individuals who reside in long-term care facilities or other institutional settings are investigated separately
‡One individual started the online investigation form but then spoke with an investigator by phone instead