Table 4.
Risk score comparison, based on answers to returned prisoner self‐questionnaire.
| Risk score comparison (lower score, less risky) | n | Median | Mean | SD | SE (difference) | Observed difference (95 % CI for difference) |
|---|---|---|---|---|---|---|
| Random assignment | ||||||
| NOR | 112 | 4.00 | 3.86 | 3.34 | 0.48 | 0.34 |
| Control | 93 | 2.00 | 3.52 | 3.43 | (−0.59 to 1.27) | |
| Safer behaviour as N‐ALIVE participant? | ||||||
| No change/unsafe | 115 | 3.00 | 3.87 | 3.54 | 0.47 | 0.38 |
| Safer | 90 | 4.00 | 3.49 | 3.18 | (−0.54 to 1.30) | |
| Safer behaviour as N‐ALIVE participant? (answers by those assigned to control group) | ||||||
| No change/unsafe | 63 | 3.00 | 4.03 | 3.50 | 0.71 | 1.60* |
| Safer | 30 | 2.00 | 2.43 | 3.07 | (0.20 to 3.00) | |
| Safer behaviour as N‐ALIVE participant? (answers by those assigned to NOR group) | ||||||
| No change/unsafe | 52 | 3.50 | 3.67 | 3.61 | 0.64 | –0.35* |
| Safer | 60 | 4.00 | 4.02 | 3.12 | (−1.61 to 0.91) | |
Test for interaction: difference in differences* [control– naloxone‐on‐release (NOR)] = 1.94. Standard error (SE) for difference in differences* (control‐NOR) = 0.98. Hence, 95% confidence interval (CI) for difference in differences* is from 0.008 to 3.876 (P = 0.049). SD= standard deviation; N‐ALIVE = NALoxone InVEstigation.