Table 1.
Participant characteristics
| All (n=107) | Alcohol (n=107) | Cocaine (n=45) | Cannabis (n=97) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| FRUs (n=62) | FLUs (n=45) | p | FRUs (n=25) | FLUs (n=20) | p | FRUs (n=80) | FLUs (n=17) | p | ||
| Age | 31.4 (7.4) | 31.3 (8.1) | 31.5 (6.4) | 0.93 | 33.9 (8.0) | 29.8 (9.5) | 0.12 | 30.2 (6.8) | 35.4 (8.3) | <.01 |
| IQ | 85.0 (34.7) | 85.8 (35.1) | 84.0 (35.0) | 0.80 | 90.1 (35.6) | 91.3 (32.3) | 0.91 | 81.9 (37.8) | 90.6 (26.3) | 0.37 |
| Factor 2 score | 13.4 (4.0) | 13.7 (3.8) | 12.9 (4.3) | 0.32 | 14.6 (3.2) | 13.4 (4.0) | 0.27 | 14.2 (3.5) | 10.9 (3.9) | <.01 |
| Abstinence Duration (months) | N/A | 72.7 (62.4) | 85.4(77.7) | 0.35 | 98.4 (77.5) | 95.0 (101.2) | 0.90 | 66.9 (60.0) | 187.8 (108.3) | <.01 |
| Duration of Abuse (months) | N/A | 77.2 (62.6) | N/A | N/A | 50.1 (68.5) | N/A | N/A | 108.7 (71.3) | N/A | N/A |
| Age of First Use | N/A | 12.4 (3.0) | 14.4 (3.4) | <.01 | 17.4 (3.0) | 20.0 (5.3) | 0.0 5 | 12.8 (2.7) | 15.4 (1.5) | <.01 |
| Total Intracranial Volume (mL) | 1510.9 (129.1) | 1514.1 (124.6) | 1506.6 (136.4) | 0.78 | 1508.2 (108.2) | 1514.5 (133.0) | 0.86 | 1520.8 (129.9) | 1462.0 (135.0) | 0.10 |
| Race, % (n) | ||||||||||
| Caucasian | 54(58) | 60(37) | 47(21) | 0.10a | 80(20) | 75(15) | 0.84a | 49(39) | 59(10) | 0.68a |
| African-American | 43(46) | 40(25) | 47(21) | 16(4) | 25(5) | 48(38) | 41(7) | |||
| Hispanic | 2(2) | 0(0) | 4(2) | 0(0) | 0(0) | 3(2) | 0(0) | |||
| Native American | 1(1) | 0(0) | 2(1) | 4(1) | 0(0) | 1(1) | 0(0) | |||
All data are Mean (SD) except where noted.
pa: Fisher's Exact Test