IRR/TCRR (95% CI) | p Value | |
Before versus during OMT, during OMT as reference (incidence rate=1) | ||
All incidents | 1.6 (1.3 to 1.9) | <0.001 |
Drug-related* | 4.2 (2.9 to 6.2) | <0.001 |
Overdoses | 2.8 (1.6 to 5.0) | <0.001 |
Injecting-related | 5.9 (3.1 to 11.4) | <0.001 |
Other | 5.7 (2.8 to 11.9) | <0.001 |
Non-drug-related | 0.7 (0.6 to 1.0) | 0.02 |
Injuries | 1.2 (0.9 to 1.5) | 0.23 |
Inpatient days | ||
Drug-related | 6.3 (3.4 to 11.8) | <0.001 |
Non-drug-related | 0.5 (0.3 to 1.0) | 0.04 |
Injuries | 2.1 (0.7 to 5.7) | 0.17 |
All | 1.7 (1.1 to 2.4) | 0.01 |
Outpatient contacts | ||
Drug-related | 4.8 (2.7 to 8.3) | <0.001 |
Non-drug-related | 0.7 (0.4 to 1.2) | 0.18 |
Injuries | 1.1 (0.7 to 1.6) | 0.78 |
All | 1.4 (1.0 to 1.8) | 0.04 |
After versus during OMT, during OMT as reference (incidence rate=1) | ||
All incidents | 2.8 (2.1 to 3.9) | <0.001 |
Drug-related | 11.1 (6.6 to 18.5) | <0.001 |
Overdoses | 5.8 (2.7 to 12.3) | <0.001 |
Injecting-related | 12.6 (4.3 to 36.8) | <0.001 |
Other | 16.7 (6.5 to 42.7) | <0.001 |
Non-drug-related | 1.4 (0.9 to 2.2) | 0.15 |
Injuries | 0.8 (0.3 to 1.8) | 0.57 |
Inpatient days | ||
Drug-related | 25.2 (13.1 to 48.7) | <0.001 |
Non-drug-related | 1.1 (0.5 to 2.3) | 0.78 |
Injuries | 4.6 (0.8 to 28.5) | 0.98 |
All | 5.9 (3.6 to 9.6) | <0.001 |
Outpatient contacts | ||
Drug-related | 10.6 (4.7 to 25.9) | <0.001 |
Non-drug-related | 1.6 (0.7 to 3.7) | 0.26 |
Injuries | 1.1 (0.4 to 3.1) | 0.87 |
All | 2.0 (1.1 to 3.8) | 0.03 |
The incidence rate ratios indicate the statistical significance of the changes in incidence rates demonstrated in table 1, estimated by Poisson regression (generalised estimating equations). Patient-years at risk: 1000 before, 813 during and 91 after OMT. Number of incidents: 605 before, 310 during and 106 after OMT.
IRR, incidence rate ratios; OMT, opioid maintenance treatment; TCRR, treatment contact rate ratios.
* Subgroups in italic.