Table 3.
Comparison of sequential calendar alcohol ban periods for trauma admission and operation rates per 100 days using Poisson regression
| Time period | IRR a | 95% CI | P value |
|---|---|---|---|
| Total trauma admissions | |||
| Complete ban 1 | 0.41 | 0.28, 0.60 | <0.001 |
| Partial ban 1 | 1.90 | 1.29, 2.80 | 0.001 |
| Complete ban 2 | 0.54 | 0.36, 0.79 | 0.002 |
| Partial ban 2 | 2.63 | 0.82, 3.78 | <0.001 |
| Stab wound admissions | |||
| Complete ban 1 | 0.43 | 0.27, 0.71 | 0.001 |
| Partial ban 1 | 1.96 | 1.18, 3.23 | 0.009 |
| Complete ban 2 | 0.38 | 0.22, 0.66 | 0.001 |
| Partial ban 2 | 3.53 | 2.06, 6.05 | <0.001 |
| Trauma‐related operations | |||
| Complete ban 1 | 0.31 | 0.18, 0.52 | <0.001 |
| Partial ban 1 | 1.83 | 1.03, 3.26 | 0.039 |
| Complete ban 2 | 0.61 | 0.35, 1.06 | 0.077 |
| Partial ban 2 | 3.50 | 2.13, 5.75 | <0.001 |
a
Reference group is the prior period, that is, period 2 versus 1 (ref); period 3 versus 2 (ref); period 4 versus 3 (ref); period 5 versus 4 (ref). Statistically significant differences are marked in bold (P <0.05). CI, confidence interval; IRR, incidence rate ratio.