Table 3.
Relative Risks (RRs) of Injury Related to Alcohol and Drug use from Case-crossover Analysis by Demographic, Injury and Drinking Characteristics and Test of HomogeneityBased on Multiple Matching of Substance Use Yesterday and Last Week
| Alcohol only | Both alcohol and drugs |
|
|---|---|---|
| Gender | (p=0.583) 1 | (p=0.333) |
| Men | 3.6 (2.1, 6.2)*** | 3.7 (1.4, 10.0)* |
| Women | 2.8 (1.3, 6.1)* | 1.28 (0.19, 8.58) |
| Age | (p=0.583) | (p=0.087) |
| 18–29 | 3.0 (1.6, 5.5)*** | 1.42 (0.43, 4.71) |
| 30+ | 3.8 (2.0, 7.3)*** | 7.1 (1.7, 29.5)** |
| Injury type | (p=0.283) | (p=0.732) |
| Intentional | 7.0 (1.7, 29.9)** | 4.0 (0.7, 23.3) |
| Unintentional | 3.1 (1.9, 4.9)*** | 3.1 (1.03, 9.3)* |
| Heavy drinking | (p=0.893) | (N.A.) 2 |
| 5+ at least once | 3.2 (2.0, 5.2)*** | 2.6 (1.05, 6.4)* |
| No 5+ last year | 3.4 (1.1, 10.1)* | N.A. 2 |
| Alcohol dependence | (p=0.829) | (p=0.108) |
| Positive Raps4 | 3.1 (1.6, 5.9)** | 4.2 (1.4, 12.8)* |
| Negative Raps4 | 3.4 (1.8, 6.4)*** | 0.71 (0.10, 5.03) |
*
p<0.05,
**
p<0.01,
***
p<0.001
1
χ2 test of homogeneity
2
Because all drug and alcohol users, either before the injury event or in the control periods, had 5+ at least once last year; the effect cannot be estimated