Table 1.
Baseline characteristics of study participants †
| Characteristic: | Placebo (n = 726) | Vitamin E (n = 726) | Selenium (n = 759 ) | Vitamin E + selenium (n = 709) |
|---|---|---|---|---|
| Age at SELECT randomization, years | ||||
| Median (interquartile range) | 61.7 (57.6–67.5) | 61.5 (57.6–66.2) | 61.6 (57.7–66.8) | 61.5 (57.9–66.6) |
| 50-54 | 56 (8) | 48 (7) | 54 (7) | 48 (7) |
| 55-64 | 418 (58) | 459 (63) | 466 (62) | 435 (61) |
| 65-74 | 212 (29) | 190 (26) | 208 (27) | 192 (27) |
| ≥75 | 40 (6) | 29 (4) | 31 (4) | 34 (5) |
| Race/ethnicity | ||||
| White | 510 (70) | 491 (68) | 515 (68) | 489 (69) |
| African American | 165 (23) | 177 (24) | 189 (25) | 162 (23) |
| Hispanic (non-African American) | 20 (3) | 32 (4) | 22 (3) | 22 (3) |
| Hispanic (African American) | 6 (1) | 3 (<1) | 5 (<1) | 5 (1) |
| Other | 25 (3) | 23 (3) | 28 (4) | 31 (4) |
| Education (highest level) | ||||
| ≤High school graduate or GED | 157 (22) | 172 (24) | 176 (23) | 169 (24) |
| Some college/vocational school | 210 (29) | 221 (30) | 216 (28) | 203 (29) |
| ≥College graduate | 348 (48) | 327 (45) | 361 (48) | 335 (47) |
| Unknown/missing | 11 (1) | 6 (1) | 6 (1) | 2 (<1) |
| Smoking status | ||||
| Never | 262 (36) | 239 (33) | 280 (37) | 236 (33) |
| Current | 113 (15) | 123 (17) | 108 (14) | 114 (16) |
| Former | 338 (47) | 349 (48) | 363 (48) | 351 (50) |
| Ever (Unknown current status)‡ | 6 (1) | 9 (1) | 5 (1) | 7 (1) |
| Unknown | 7 (1) | 6 (1) | 3 (<1) | 1 (<1) |
| Height at SELECT Randomization (cm), mean (standard deviation) | 176.8 (8.2) | 176.2 (7.8) | 176.8 (7.3) | 176.4 (7.8) |
†Number (percent) unless otherwise noted.
‡Participants who were ever smokers, but did not report current status to differentiate current versus former.