Table 1.
Descriptive statistics
| Total sample | Women | Men | ||||
|---|---|---|---|---|---|---|
| Measure | Mean (s.d.) | Range | Mean (s.d.) | Range | Mean (s.d.) | Range |
| Hippocampal volume (mm3) | 8256.84 (812.84) | 6272.60– 10 649.80 | 7950.15 (715.01) | 6272.60–9795.50 | 8683.18 (747.13) | 6969.50– 10 649.80 |
| Substance use composite | 0.00 (0.83) | −1.56–2.11 | −0.25 (0.76) | −1.56–1.94 | 0.35 (0.79) | −1.56–2.11 |
| Drink Index | 2.79 (0.97) | 0.00–4.75 | 2.52 (0.92) | 0.00–4.50 | 3.17 (0.91) | 0.00–4.75 |
| Cannabis Index | 1.73 (1.76) | 0.00–5.00 | 1.30 (1.57) | 0.00–5.00 | 2.31 (1.85) | 0.00–5.00 |
| Cigarettes per day | 0.95 (1.13) | 0.00–4.00 | 0.67 (1.04) | 0.00–4.00 | 1.32 (1.14) | 0.00–4.00 |
Note: Unadjusted hippocampal volume is reported in this table. All substance use scores were greater for men compared to women (all 95% CIs contrasting men and women did not contain zero).