Prevalence of substance use among road traffic injury patients
| Before injury (6 hours) | First control period | Second control period | ||||
| n | % | n | % | n | % | |
| Alcohol | ||||||
| Self-report | 93 | 21.5 | 23 | 6.9 | 15 | 5.0 |
| Alcosensor (BAC≥0.001) | 63 | 19.0 | – | – | – | – |
| Self-report or alcosensor | 102 | 23.6 | – | – | – | – |
| Alcosensor or SR if missing | 82 | 18.9 | ||||
| Cannabis | ||||||
| Self-report | 32 | 7.4 | 20 | 6.1 | 21 | 7.0 |
| Oral fluid | 21 | 6.7 | – | – | – | – |
| Self-report or oral fluid | 47 | 10.9 | – | – | – | – |
| Oral fluid or SR if missing | 29 | 6.7 | – | – | – | – |
Before injury and two control periods, by type of substance and measurement. One public hospital from Mexico City, 2022 (n=433*).
*Prevalences were computed with different sample sizes, according to type of measurement and time period (see the STROBE diagram).
BAC, breath alcohol concentration; STROBE, Strengthening the Reporting of Observational Studies in Epidemiology.