Table 1.
Demographic Characteristics of 2018 U.S. Population, Responders, and Nonresponders
| Demographic characteristic | 2018 U.S. population | Responders | Nonresponders | Test of difference between responders and nonresponders |
|---|---|---|---|---|
| At-risk age group ≥65 years | 16% | 20% (1,333 out of 6,684) | 20% (359 out of 1,798) | χ(1)=0.00, p=0.98 |
| Male | 49% | 48% (3,226 out of 6,684) | 49% (872 out of 1,799) | χ(1)=0.02, p=0.88 |
| African American | 13% | 12% (768 out of 6,684) | 14% (244 out of 1,799) | χ(1)=5.80, p=0.02 |
| Hispanic/Latinx | 18% | 16% (1,097 out of 6,684) | 18% (319 out of 1,799) | χ(1)=1.78, p=0.18 |
| Other minority | 9% | 9% (587 out of 6,684) | 8% (144 out of 1,799) | χ(1)=1.09, p=0.30 |
| White | 60% | 63% (4,232 out of 6,684) | 61% (1,092 out of 1,799) | χ(1)=4.18, p=0.04 |
| College degree | 32% | 34% (2,290 out of 6,684) | 32% (581 out of 1,805) | χ(1)=2.73, p=0.10 |
| Household income, median | $60,293 | $50,000–$59,000 | $50,000–$59,000 | M-W=6,003,157.50, p<0.001 |
| Below-median income | — | 45% (2,989 out of 6,684) | 52% (929 out of 1,790) | χ(1)=29.29, p<0.001 |
| Live in worst-hit state | 25% | 22% (1,482 out of 6,684) | 25% (458 out of 1,805) | χ(1)=8.26, p<0.01 |
Note: 2018 U.S. population statistics as reported by the U.S. Census Bureau (www.census.gov/quickfacts/fact/table/US/PST045218), with percent with college degree for population aged 25 and older. Worst-hit states at the time of the survey were California, Massachusetts, New Jersey, New York, and Washington. There were 6,684 responders and 1,805 nonresponders among the 8,489 invitees, but a few nonresponders had missing data for specific characteristics.
M-W, Mann-Whitney nonparametric test.