Sample characteristics
| n/mean | %/SD | |
| Sex | ||
| Male | 12 428 | 46.30 |
| Female | 14 417 | 53.70 |
| Race/ethnicity | ||
| White | 21 632 | 80.58 |
| Black | 4145 | 15.44 |
| Other minority | 1068 | 3.98 |
| 1960 grade | ||
| Freshman | 7247 | 27.00 |
| Sophomore | 6831 | 25.45 |
| Junior | 6522 | 24.30 |
| Senior | 6245 | 23.26 |
| Vital status | ||
| Follow-up years | 47.8243 | 4.18743 |
| Survivors | 23 323 | 86.88 |
| Deceased | 3522 | 13.12 |
n=26 845.