| Variable | Number of Subjects | Age, Mean ± SD | ASA, Completed (% ASA) |
| All Subjects | 1719 | 33 ± 13 | 198, 1521 (11%) |
| Male | 1134 | 33 ± 9 | 125, 1134 (11%) |
| Female | 585 | 37 ±12 | 56, 529 (10%) |
| Alcohol | 1075 | 41 ± 12 | 97, 978, (9%) |
| Male | 654 | 39 ± 7 | 58, 596 (9%) |
| Female | 421 | 43 ± 8 | 28, 393 (7%) |
| Heroin | 644 | 24 ± 6 | 101, 543 (16%) |
| Male | 485 | 25 ± 5 | 72, 413 (15%) |
| Female | 159 | 23 ± 4 | 29, 130 (18%) |