Table 4.
Poisson Hierarchical Linear Modeling Results of Overdose Risk Behavior Scale 2 (ORBS-2) Subscales Predicting Days Overdose Each Month
| ORBS-2 Subscale | Unadjusted | Adjusted for Demographicsa | ||
|---|---|---|---|---|
| Level of Analysis | Incidence Ratio | 95% CI | Incidence Ratio | 95% CI |
| Prescription Misuse | ||||
| Between-Person Differences at Baseline | 1.05 | (0.89,1.25) | 1.08 | (0.91,1.29) |
| Within-Person Variation each Month | 1.18 | (1.15,1.22) | 1.18 | (1.15,1.22) |
| Risky Non-Injection Use | ||||
| Between-Person Differences at Baseline | 1.25 | (1.06,1.47) | 1.22 | (1.04,1.44) |
| Within-Person Variation each Month | 1.29 | (1.26,1.33) | 1.29 | (1.26,1.33) |
| Injection Drug Use & Speedballing | ||||
| Between-Person Differences at Baseline | 1.20 | (1,1.43) | 1.10 | (0.91,1.32) |
| Within-Person Variation each Month | 1.29 | (1.23,1.35) | 1.28 | (1.22,1.34) |
| Opioid and Alcohol Combinations | ||||
| Between-Person Differences at Baseline | 1.06 | (0.88,1.27) | 1.07 | (0.89,1.28) |
| Within-Person Variation each Month | 1.11 | (1.05,1.16) | 1.11 | (1.06,1.17) |
| Opioid and Benzodiazepine Combinations | ||||
| Between-Person Differences at Baseline | 1.34 | (1.13,1.58) | 1.30 | (1.1,1.54) |
| Within-Person Variation each Month | 1.02 | (0.98,1.06) | 1.01 | (0.97,1.05) |
| Polysubstance Combinations | ||||
| Between-Person Differences at Baseline | 1.08 | (0.91,1.29) | 1.08 | (0.91,1.29) |
| Within-Person Variation each Month | 0.98 | (0.94,1.03) | 0.98 | (0.94,1.03) |
Note. Values significant at p<.05 bolded for ease of interpretation. Each subscale standardized to facilitate comparisons.
a
Coefficients adjusted for: Age, race, education, and history of overdose across all waves (i.e., slope-intercept model).