Table 1.
Characteristics of the study participants, Indiana University Bloomington undergraduate students, September 2020
| Antibody test |
Self-reported positive SARS-CoV-2 test |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall 1076 |
Negative 1027 |
Positive 49 |
Overall 1239 |
No 1111 |
Yes 128 |
|||||||
| N | (%) | N | (%) | N | (%) | N | (%) | N | (%) | N | (%) | |
| Age | ||||||||||||
| 18 years | 208 | (20.6) | 198 | (20.5) | 10 | (21.7) | 247 | (21.2) | 217 | (20.9) | 30 | (24.0) |
| 19 years | 224 | (22.2) | 215 | (22.3) | 9 | (19.6) | 253 | (21.7) | 223 | (21.5) | 30 | (24.0) |
| 20 years | 228 | (22.6) | 219 | (22.7) | 9 | (19.6) | 254 | (21.8) | 231 | (22.2) | 23 | (18.4) |
| 21 years | 255 | (25.3) | 241 | (25.0) | 14 | (30.4) | 297 | (25.5) | 263 | (25.3) | 34 | (27.2) |
| 22 + years | 95 | (9.4) | 91 | (9.4) | 4 | (8.7) | 113 | (9.7) | 105 | (10.1) | 8 | (6.4) |
| Missing | 66 | 63 | 3 | 75 | 72 | 3 | ||||||
| Sex at birth | ||||||||||||
| Female | 689 | (64.3) | 655 | (64.0) | 34 | (70.8) | 786 | (63.5) | 709 | (63.8) | 77 | (60.6) |
| Male | 382 | (35.7) | 368 | (36.0) | 14 | (29.2) | 452 | (36.5) | 402 | (36.2) | 50 | (39.4) |
| Missing | 5 | 4 | 1 | 1 | 0 | 1 | ||||||
| Race | ||||||||||||
| Asian | 80 | (7.5) | 77 | (7.5) | 3 | (6.1) | 95 | (7.7) | 90 | (8.1) | 5 | (3.9) |
| Black | 13 | (1.2) | 13 | (1.3) | 0 | (.0) | 24 | (1.9) | 24 | (2.2) | 0 | (.0) |
| Multiracial | 85 | (7.9) | 80 | (7.8) | 5 | (10.2) | 101 | (8.2) | 84 | (7.6) | 17 | (13.3) |
| Other | 46 | (4.3) | 43 | (4.2) | 3 | (6.1) | 59 | (4.8) | 58 | (5.2) | 1 | (.8) |
| White | 847 | (79.1) | 809 | (79.2) | 38 | (77.6) | 959 | (77.5) | 854 | (76.9) | 105 | (82.0) |
| Missing | 5 | 5 | 0 | 1 | 1 | 0 | ||||||
| Hispanic or Latinx ethnicity | ||||||||||||
| No | 998 | (92.8) | 955 | (93.0) | 43 | (87.8) | 1146 | (92.5) | 1028 | (92.5) | 118 | (92.2) |
| Yes | 78 | (7.3) | 72 | (7.0) | 6 | (12.2) | 93 | (7.5) | 83 | (7.5) | 10 | (7.8) |
| Year in school | ||||||||||||
| 1st | 236 | (22.1) | 224 | (21.9) | 12 | (24.5) | 280 | (22.7) | 249 | (22.5) | 31 | (24.4) |
| 2nd | 246 | (23.0) | 235 | (23.0) | 11 | (22.4) | 277 | (22.4) | 245 | (22.1) | 32 | (25.2) |
| 3rd | 264 | (24.7) | 255 | (25.0) | 9 | (18.4) | 302 | (24.4) | 276 | (24.9) | 26 | (20.5) |
| 4th | 297 | (27.8) | 281 | (27.5) | 16 | (32.7) | 343 | (27.8) | 306 | (27.6) | 37 | (29.1) |
| 5th | 27 | (2.5) | 26 | (2.5) | 1 | (2.0) | 34 | (2.8) | 33 | (3.0) | 1 | (.8) |
| Missing | 6 | 6 | 0 | 0 | 3 | 2 | 1 | |||||
| Residence | ||||||||||||
| Off campus | 738 | (68.9) | 705 | (69.0) | 33 | (67.3) | 844 | (68.2) | 764 | (68.8) | 80 | (62.5) |
| On campus | 333 | (31.1) | 317 | (31.0) | 16 | (32.7) | 394 | (31.8) | 346 | (31.2) | 48 | (37.5) |
| Missing | 5 | 5 | 0 | 1 | 1 | 0 | ||||||
| Greek membership | ||||||||||||
| No | 812 | (75.9) | 788 | (77.2) | 24 | (49.0) | 943 | (76.3) | 870 | (78.5) | 73 | (57.0) |
| Yes | 258 | (24.1) | 233 | (22.8) | 25 | (51.0) | 293 | (23.7) | 238 | (21.5) | 55 | (43.0) |
| Missing | 6 | 6 | 0 | 3 | 3 | 0 | ||||||
| Relationship status | ||||||||||||
| Single and not dating/hooking up with anyone | 432 | (40.3) | 415 | (40.6) | 17 | (34.7) | 499 | (40.3) | 448 | (40.4) | 51 | (39.8) |
| Single and dating/hooking up with multiple people | 101 | (9.4) | 91 | (8.9) | 10 | (20.4) | 121 | (9.8) | 94 | (8.5) | 27 | (21.1) |
| Single and dating/hooking up with one specific person | 138 | (12.9) | 133 | (13.0) | 5 | (10.2) | 165 | (13.3) | 151 | (13.6) | 14 | (10.9) |
| In a relationship but not living together | 358 | (33.4) | 342 | (33.4) | 16 | (32.7) | 404 | (32.6) | 368 | (33.2) | 36 | (28.1) |
| Living together but not married | 40 | (3.7) | 40 | (3.9) | 0 | (.0) | 46 | (3.7) | 46 | (4.1) | 0 | (.0) |
| Married and living together | 3 | (.3) | 2 | (.2) | 1 | (2.0) | 3 | (.2) | 3 | (.3) | 0 | (.0) |
| Missing | 4 | 4 | 0 | 1 | 1 | 0 | ||||||
| Self-report positive test | ||||||||||||
| No | 961 | (90.8) | 944 | (93.2) | 17 | (37.0) | -- | -- | -- | -- | -- | -- |
| Yes | 98 | (9.3) | 69 | (6.8) | 29 | (63.0) | -- | -- | -- | -- | -- | -- |
| Missing | 17 | 14 | 3 | -- | -- | -- | -- | -- | -- | |||
| Symptomatica | ||||||||||||
| No | 23 | (24.0) | 18 | (26.9) | 5 | (17.2) | 31 | (24.6) | 0 | (.0) | 31 | (24.6) |
| Yes | 73 | (76.0) | 49 | (73.1) | 24 | (82.8) | 95 | (75.4) | 0 | (.0) | 95 | (75.4) |
| Missing | 980 | 960 | 20 | 1113 | 1111 | 2 | ||||||
| Know others who were infected | ||||||||||||
| No | 510 | (49.4) | 501 | (50.9) | 9 | (18.8) | 581 | (48.6) | 551 | (51.5) | 30 | (23.8) |
| Yes | 523 | (50.6) | 484 | (49.1) | 39 | (81.3) | 614 | (51.4) | 518 | (48.5) | 96 | (76.2) |
| Missing | 43 | 42 | 1 | 44 | 42 | 2 | ||||||
| Number of days in a week drinking alcohol | ||||||||||||
| 1 day or less | 577 | (54.0) | 558 | (54.7) | 19 | (39.6) | 652 | (53.3) | 600 | (54.6) | 52 | (41.6) |
| More than 1 day | 491 | (46.0) | 462 | (45.3) | 29 | (60.4) | 572 | (46.7) | 499 | (45.4) | 73 | (58.4) |
| Missing | 8 | 7 | 1 | 15 | 12 | 3 | ||||||
| Number of people hanging out with while drinkingb | ||||||||||||
| 5 people or less | 476 | (66.5) | 457 | (67.6) | 19 | (47.5) | 542 | (65.5) | 496 | (67.7) | 46 | (48.9) |
| More than 5 people | 240 | (33.5) | 219 | (32.4) | 21 | (52.5) | 285 | (34.5) | 237 | (32.3) | 48 | (51.1) |
| Missing | 360 | 351 | 9 | 412 | 378 | 34 | ||||||
SARS-CoV-2 = severe acute respiratory syndrome coronavirus 2.
a
Among participants who self-reported a positive test.
b
Among participants who self-reported alcohol drinking.