Table 2.
Characteristics of students participating in a COVID-19 serology investigation — fall academic semester 2021, Wisconsin
| Participation Month | Overall | |||||||
|---|---|---|---|---|---|---|---|---|
| September only | September and December | December only | ||||||
| Total number of participants, No. (%) | 184 | 100% | 39 | 100% | 133 | 100% | 356 | 100% |
| Age (yrs), mean (sd) | 19.1 | 1.3 | 20 | 1.9 | 20 | 2.6 | 19.5 | 2 |
| Sex, No. (%) | ||||||||
| Female | 97 | 52.7% | 25 | 64.1% | 78 | 58.6% | 200 | 56.2% |
| Male | 77 | 41.8% | 13 | 33.3% | 53 | 39.8% | 143 | 40.2% |
| Nonbinary or other | 2 | 1.1% | 0 | -- | 1 | 0.8% | 3 | 0.8% |
| Refused or missing | 8 | 4.3% | 1 | 2.6% | 1 | 0.8% | 10 | 2.8% |
| Race, No. (%) | ||||||||
| Asian | 79 | 42.9% | 11 | 28.2% | 38 | 28.6% | 128 | 36.0% |
| Black | 6 | 3.3% | 0 | -- | 1 | 0.8% | 7 | 2.0% |
| White | 82 | 44.6% | 27 | 69.2% | 89 | 66.9% | 198 | 55.6% |
| Other | 8 | 4.3% | 0 | 0% | 3 | 2.3% | 11 | 3.1% |
| Refused or missing | 9 | 4.9% | 1 | 2.6% | 2 | 1.6% | 12 | 3.4% |
| Ethnicity, No. (%) | ||||||||
| Hispanic or Latino | 10 | 5.4% | 0 | -- | 5 | 3.8% | 15 | 4.2% |
| Non-Hispanic or Latino | 149 | 81.0% | 38 | 97.4% | 121 | 91.0% | 308 | 86.5% |
| Refused or missing | 25 | 13.6 % | 1 | 2.6% | 7 | 5.3% | 33 | 9.3% |
| Class, No. (%) | ||||||||
| Freshman | 134 | 72.8% | 19 | 48.7% | 57 | 42.9% | 210 | 59.0% |
| Sophomore | 26 | 14.1% | 9 | 23.1% | 43 | 32.3% | 78 | 21.9% |
| Junior | 6 | 3.3% | 4 | 10.3% | 16 | 12.0% | 26 | 7.3% |
| Senior | 6 | 3.3% | 6 | 15.4% | 10 | 7.5% | 22 | 6.2% |
| Graduate and above | 5 | 2.7% | 1 | 2.6 % | 6 | 4.5% | 12 | 3.4% |
| Refused or missing | 7 | 3.8 % | 0 | -- | 1 | 0.8% | 8 | 2.2% |
| Immunocompromised condition, No. (%)a | ||||||||
| Yes | 4 | 2.2% | 0 | -- | 6 | 4.5% | 10 | 2.8% |
| Refused or missing | 7 | 3.8% | 0 | -- | 1 | 0.8% | 8 | 2.2% |
| Home country | ||||||||
| United States | n/a | -- | 29 | 74.4% | 99 | 74.4% | n/a | -- |
| China | n/a | -- | 6 | 15.4% | 16 | 12.0% | n/a | -- |
| India | n/a | -- | 0 | -- | 8 | 6.0% | n/a | -- |
| South Korea | n/a | -- | 0 | -- | 4 | 3.0% | n/a | -- |
| Otherb | n/a | -- | 4 | 10.3% | 5 | 3.8% | n/a | -- |
| Missing | n/a | -- | 0 | -- | 1 | 0.8% | n/a | -- |
aPresence of HIV/AIDS, recent organ transplant, or other immunocompromising condition
bIncludes Bangladesh (Sep/Dec – 0, Dec – 1), Germany (Sep/Dec – 1), Indonesia (Sep/Dec – 1), Kazakhstan (Dec – 1), Malaysia (Dec – 1), Pakistan (Sep/Dec – 1), United Arab Emirates (Sep/Dec – 1), and Vietnam (Dec – 1)