Table 1.
Demographic characteristics of study participants.
| D4A participant | |||
|---|---|---|---|
| Assay subset | Non-assay subset | Non-participant | |
| (N = 1313) | (N = 218) | (N = 7768) | |
| Age (years) | |||
| Median [IQR] | 47.0 [36.0, 58.0] | 42.0 [34.0, 60.0] | 49.0 [37.0, 60.0] |
| Median [min, max] | 47.0 [19.0, 99.0] | 42.0 [18.0, 91.0] | 49.0 [18.0, 861] |
| Race | |||
| White | 1220 (92.9%) | 194 (89.0%) | 6206 (79.9%) |
| Aggregated categorya | 12 (0.9%) | 2 (0.9%) | 256 (3.3%) |
| Listed more than one race or ethnicity | 6 (0.5%) | 0 (0%) | 18 (0.2%) |
| Missing | 75 (5.7%) | 22 (10.1%) | 1288 (16.6%) |
| Gender | |||
| Female | 879 (66.9%) | 113 (51.8%) | 0 (0%) |
| Male | 424 (32.3%) | 54 (24.8%) | 0 (0%) |
| Non-binary/transgender/self-described | 10 (0.8%) | 1 (0.5%) | 0 (0%) |
| Prefer not to answer | 0 (0%) | 0 (0%) | 0 (0%) |
| Missing | 0 (0%) | 50 (22.9%) | 7768 (100%) |
| Household income (USD) | |||
| $200,000 and over | 137 (10.4%) | 21 (9.6%) | 681 (8.8%) |
| $150,000 to $199,999 | 186 (14.2%) | 24 (11.0%) | 764 (9.8%) |
| $100,000 to $149,999 | 348 (26.5%) | 54 (24.8%) | 1502 (19.3%) |
| $75,000 to $99,999 | 179 (13.6%) | 31 (14.2%) | 1093 (14.1%) |
| $50,000 to $74,999 | 175 (13.3%) | 27 (12.4%) | 957 (12.3%) |
| $25,000 to $49,999 | 142 (10.8%) | 22 (10.1%) | 747 (9.6%) |
| Under $25,000 | 43 (3.3%) | 13 (6.0%) | 256 (3.3%) |
| Prefer not to answer | 102 (7.8%) | 26 (11.9%) | 799 (10.3%) |
| Missing | 1 (0.1%) | 0 (0%) | 969 (12.5%) |
Non-D4A participants are all participants in the initial anonymous survey from which Data4Action participants were drawn. D4A participants are divided into subsets for which antibody assays were conducted (N = 1313) and those for which assays were not conducted (N = 218).
aAsian; Hispanic, Lantino/a, or Spanish; Black or African American; Middle Eastern or North African; Native American or Alaska Native; other race or ethnicity. This category is aggregated to protect participant identities because no single group comprised > 4% of participants.