Counts of ambulance and ED contacts, mean and SD stratified by postrelease opioid agonist treatment exposure (OAT; none: n=156, interrupted: n=34, retained: n=75), unadjusted (IRR) and adjusted incidence rate ratios (AIRR) and 95% CIs comparing use of emergency healthcare postrelease according to OAT use in the first 3 months postrelease among a cohort of men who regularly injected drugs prior to imprisonment (n=265)
| Outcome | Count of contacts | Mean of contacts (SD) | IRR (95% CI) | P value | AIRR* (95% CI) | P value |
| 1. Ambulance contacts | 77 | 0.29 (0.80) | ||||
| OAT: none | 51 | 0.33 (0.80) | 1.00 | 1.00 | ||
| OAT: interrupted | 11 | 0.32 (0.88) | 0.97 (0.45 to 2.09) | 0.943 | 0.54 (0.21 to 1.34) | 0.182 |
| OAT: retained | 15 | 0.20 (0.77) | 0.66 (0.35 to 1.27) | 0.216 | 0.33 (0.14 to 0.76) | 0.009 |
| 2. ED contacts | 127 | 0.46 (1.12) | ||||
| OAT: none | 81 | 0.52 (1.12) | 1.00 | 1.00 | ||
| OAT: interrupted | 14 | 0.41 (1.08) | 0.83 (0.42 to 1.67) | 0.604 | 0.54 (0.23 to 1.24) | 0.144 |
| OAT: retained | 28 | 0.37 (1.15) | 0.77 (0.46 to 1.30) | 0.335 | 0.43 (0.22 to 0.83) | 0.012 |
*Adjusted for age at baseline, Aboriginal and/or Torres Strait Islander, historical psychiatric admission, self-reported fair or poor health, times moved accommodation, count of general practitioner consultations, psychiatric well-being (GHQ-12 score) and any IDU since baseline interview.
GHQ-12, 12-item General Health Questionnaire; IDU, injecting drug use.