Summary of Sample Size and Mean Number of Shocks for Each Variable
| Variable | n | Mean Number of Shocks |
|---|---|---|
| No substances | 135 | 1.58 |
| Substances (alcohol, stimulants, other, multiple) | 91 | 1.58 |
| Alcohol | 62 | 1.42 |
| Stimulants | 11 | 2.55 |
| Mental illness | 38 | 1.92 |
| No mental illness | 195 | 1.50 |
Each category may include individuals from other categories (e.g., some who use substances may also have a mental illness, and some who have no mental illness have substance use), and the total therefore exceeds the sample size.