Table 1. Characteristics of Individuals Included in the Sample.
| 2007-2013 | 2014-2018 | |
|---|---|---|
| Total sample size, No. | ||
| Survey-weighted person-years in 1000s | 435 565 | 193 699 |
| Unweighted unique personsa | 26 241 | 13 024 |
| Characteristic, unweighted No. (%) | ||
| Age category, y | ||
| ≤18 | 1864 (7.1) | 960 (7.4) |
| 19-35 | 2363 (9.0) | 1291 (9.9) |
| 36-64 | 9921 (37.8) | 5720 (43.9) |
| ≥65 | 12 093 (46.1) | 5053 (38.8) |
| Sex | ||
| Women | 15 168 (57.8) | 7504 (57.6) |
| Men | 11 073 (42.2) | 5520 (42.4) |
| Race | ||
| White only | 20 011 (76.3) | 9908 (76.1) |
| Black only | 4123 (15.7) | 1986 (15.2) |
| Otherb | 2107 (8.0) | 1130 (8.7) |
| Poor health at any time within year | 2736 (10.4) | 1445 (11.1) |
| Individual personal income, mean (95% CI), $ | 37 575 (36 630-38 520) | 42 207 (41 018-43 395) |
| Not employed at any time within year | 11 648 (44.4) | 6541 (50.2) |
| 4 y of college education | 4066 (15.5) | 2210 (17.0) |
| Insurance coverage typec | ||
| Medicare coverage entire year | 8897 (33.9) | 5773 (44.3) |
| Commercial coverage entire year | 15 086 (57.5) | 6645 (51) |
| Uninsured entire year | 2468 (9.4) | 672 (5.2) |
| Single-source branded drug purchases per year, mean (95% CI) | 8 (8-8) | 6 (6-6) |
a
The total number of unique persons is 38 131 because a small number of individuals are observed in both 2013 and 2014.
b
Other includes Native American or Native Alaskan, Asian, and Native Hawaiian or Pacific Islander individuals and individuals with multiple races.
c
A small number of unique persons changed between Medicare, Commercial, or uninsured status between years.