Current substance use and road traffic injury among school-going adolescents in African countries: a multi-country survey-weighted analysis of Global School-based Student Health Survey data, 2003- 2017
This multi-country survey-weighted analysis of 12 African nations found that current substance use, particularly cannabis and polysubstance use, is significantly associated with an increased risk of road traffic injuries among school-going adolescents, highlighting the need for integrated, context-specific prevention strategies despite observed country-level heterogeneity.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Every year, millions of young people around the world face the threat of serious injury or death on the roads. For children and teenagers, traffic accidents are not just a random hazard; they are a leading cause of preventable tragedy. This danger is particularly acute in low- and middle-income countries, where rapid growth in the number of vehicles often outpaces the development of safe roads and traffic laws. In these settings, the risks are compounded by the natural developmental stage of adolescence, a time when young people gain independence, begin to experiment with substances like alcohol and drugs, and are more prone to taking risks. While hospitals and emergency rooms provide a window into the most severe cases, they often miss the broader picture of how many teenagers are hurt, or what behaviors might be putting them in harm's way before they ever reach a doctor. To understand the full scope of this problem, researchers need to look at the daily lives of students while they are still in school, asking them directly about their habits and their experiences with injury.
A team of researchers set out to fill this gap by analyzing data from twelve different African countries. They turned to a massive, standardized survey called the Global School-based Student Health Survey, which has been asking students about their health and safety for decades. The team combined information from twenty separate surveys conducted between 2003 and 2017, creating a single, unified dataset that included over 44,000 adolescents. Their goal was to see if there was a link between the use of substances—specifically alcohol, cigarettes, and cannabis—and the likelihood of being seriously injured in a motor vehicle crash. They focused on the most serious injury a student had suffered in the past year, asking whether a car or truck was the main cause. By looking at this data together, they could spot patterns that might be invisible when looking at just one country or one year.
The results revealed a clear and concerning connection. Overall, about 6 percent of the students surveyed reported that a motor vehicle crash was the cause of their most serious injury in the last year. This number was not the same for everyone; boys were significantly more likely to report such an injury than girls. However, the most striking finding was the relationship between substance use and injury. Students who currently used any of the substances studied were much more likely to have been injured in a crash compared to those who did not. The risk was not the same for every substance. While drinking alcohol or smoking cigarettes increased the odds of injury, using cannabis was associated with the highest risk. Students who used cannabis were far more likely to have been seriously injured in a traffic crash than those who did not.
The danger grew even sharper when students used more than one type of substance. The researchers found a step-by-step increase in risk: the more types of substances a student used, the higher their chance of being injured. Those who used no substances had the lowest injury rate, while those who used all three types of substances—alcohol, cigarettes, and cannabis—had the highest. This pattern suggests that using multiple substances creates a cluster of behaviors that significantly elevates the risk of a traffic accident. The study also showed that this link held true even after accounting for differences in age, sex, and the specific country where the student lived.
Despite these strong connections, the researchers were careful to note that the data does not prove that using a substance directly causes a crash. The surveys asked about substance use in the last month and injuries in the last year, so it is impossible to know exactly which came first or if other factors were involved. Furthermore, the strength of the link varied greatly from country to country. In some nations, the association was very strong, while in others, it was much weaker or even non-existent. This variation likely reflects differences in local road conditions, how teenagers travel, and how strictly traffic laws are enforced. The study also had limitations, such as relying on students to remember their past behaviors and injuries, and only including students who were currently attending school, which means the findings might not apply to those who have dropped out.
Ultimately, this research paints a picture of a complex public health challenge. It suggests that for school-going adolescents in these African countries, the path to road safety is intertwined with the path to substance prevention. The data indicates that young people who are currently using substances represent a group at particularly high risk for traffic injuries. Because the risks vary so much from place to place, a single, one-size-fits-all solution will not work. Instead, the findings support the idea that schools and health programs should look for ways to address substance use and road safety together, tailoring their approaches to fit the specific realities of each community. By understanding these links, communities can better protect their young people from a leading cause of preventable harm.
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