Table 1.
Subject Demographics
| Patients with Cannabis Use (n=14) | Healthy Controls (n=14) | Test Statistic | p | |
|---|---|---|---|---|
| Mean Age (SD), years | 19.3 (0.8) | 18.5 (1.4) | t = -1.88 | .07 |
| Sex (M/F) | 14 / 0 | 14 / 0 | ||
| Ethnicity (Caucasian/non-Caucasian)* | 0 / 14 | 3 / 11 | .22 | |
| Handedness (dextral/non-dextral)* | 10 / 3 | 12 / 1 | .59 | |
| Parental SES (high/low)1 | 9 / 1 | 13 / 0 | .44 | |
| Mean WRAT3 score (SD)2 | 84.3 (13.9) | 104.0 (17.6) | t = 3.29 | <.005 |
| Brain Volume (mm3) | 1553.5 (110) | 1426.9 (144) | t = 2.6 | <..01 |
| Mean Age at Onset of Cannabis Use (SD), years | 13.1 (1.6) | |||
| Mean Duration of Use (SD), years | 5.3 (2.1) | |||
| Mean Amount Used (SD), joints per day | 5.8 (2.6) | |||
| Mean Time since Last Use (SD), months | 6.7 (3.7) |
Note: Independent samples t – tests and Fisher's Exact tests utilized as appropriate.
*
One missing data point for patients and one for controls.
1
Socioeconomic status (SES) (Hollingshead 1975)
2
Wide Range Achievement Test (WRAT3) Reading subtest (Wilkinson 1993)