Table 4 Number of contacts by demographic and characteristics of participants

Female (n = 1,995)

426 (21.4%)

949 (47.6%)

620 (31.1%)

0.023

Male (n = 1,656)

296 (17.9%)

802 (48.4%)

558 (33.7%)

White Persons ( n = 3,373)

671 (19.9%)

1,607 (47.6%)

1,095 (32.5%)

0.486

Non-White Persons ( n = 285)

51 (17.9%)

146 (51.3%)

88 (30.9%)

Age: <40 (n = 1,066)

230 (21.6%)

471 (44.2%)

365 (34.3%)

< 0.001

Age: 40–59 (n = 1,376)

305 (22.2%)

656 (47.7%)

415 (30.2%)

Age: 60+ (n = 1,216)

187 (15.4%)

626 (51.5%)

403 (33.2%)

Education Level

High School or less (n = 935)

113 (12.1%)

465 (49.7%)

357 (38.2%)

< 0.001

1–3 years College (n = 1,046)

209 (19.9%)

495 (47.3%)

342 (32.7%)

4 years + College (n = 1,631)

395 (24.2%)

777 (47.6%)

459 (28.2%)

Health Status

Excellent or Very Good (n = 2,004)

381 (19.1%)

984 (49.1%)

639 (31.9%)

0.512

Good (n = 1,297)

270 (20.8%)

614 (47.4%)

413 (31.8%)

Fair or Poor (n = 320)

65 (20.3%)

144 (45.0%)

111 (34.7%)

Symptoms

Participants reported having 0 symptoms (n = 2,090)

412 (19.7%)

975 (46.7%)

703 (33.6%)

0.191

Participant reported having 1 symptom (n = 553)

103 (18.6%)

269 (48.6%)

181 (32.7%)

Participant reported having 2 symptoms (n = 426)

91 (21.4%)

201 (47.2%)

134 (31.5%)

Participant reported having 3 or more symptoms (n = 589)

116 (19.7%)

308 (52.3%)

165 (28.1%)

Reasons for Participating

Feel good contributing to research

Not important/barely important (n = 131)

Somewhat/Very important (n = 3,527)

20 (15.3%)

702 (19.9%)

51 (38.9%)

1,702 (48.3%)

60 (45.8%)

1,123 (31.9%)

0.003

Gaining knowledge of own Covid-19 status

Not important/barely important (n = 231)

Somewhat/Very important (n = 3,427)

38 (16.5%)

684 (19.9%)

101 (43.7%)

1,652 (48.2%)

92 (39.8%)

1,091 (31.8%)

0.038

Testing is free of charge

Not important/barely important (n = 782)

Somewhat/Very important (n = 2,876)

167 (21.4%)

555 (19.3%)

397 (50.8%)

1,356 (47.2%)

218 (27.9%)

965 (33.6%)

0.011

Covid-19 Positivity

PCR Positive (n = 37)

8 (21.6%)

17 (45.9%)

12 (32.4%)

0.952

Antibody Positive (n = 54)

9 (16.7%)

25 (46.3%)

20 (37.1%)

0.717

Any positivity (PCR or Antibody) (n = 85)

15 (17.6%)

40 (47.1%)

30 (35.3%)

0.802

Household Exposure

Someone in household was previously positive for Covid-19 (n = 52)

6 (11.5%)

21 (40.4%)

25 (48.1%)

0.039