Bridging the gap between efficacy and scale: A RE-AIM evaluation of a child drowning prevention program in Vietnam

In many parts of the world, water is a source of life, but for young children in low- and middle-income countries, it is also a silent and deadly threat. Drowning remains a leading cause of death for children in these regions, driven by a combination of open water sources near homes and a widespread lack of swimming ability. For decades, experts have known that teaching children to swim and understand water safety works in controlled trials, but a persistent challenge has been figuring out how to take those successful small-scale lessons and turn them into a massive, national system that lasts. This is the difference between proving something works in a lab and making it work in the real world, where resources are scarce, logistics are complex, and communities must take ownership. Researchers have long sought a way to measure not just whether a program saves lives, but whether it can reach enough people, be adopted by local governments, stay true to its safety rules, and continue running without endless outside funding.

A team of researchers in Vietnam recently tackled this exact challenge by evaluating a large-scale national program designed to prevent child drowning. They looked at a five-year initiative that rolled out survival swimming courses and water safety education across eleven provinces, involving hundreds of thousands of children. Using a structured framework to examine every step of the process—from how many children were reached to whether the program could survive financially—the study found that the intervention did more than just teach skills; it significantly reduced drowning deaths. The program managed to train nearly 373,400 children, a massive reach for a high-intensity safety campaign, and the data showed a clear, steady decline in drowning rates in the areas where the program operated, while rates in similar areas without the program remained unchanged. This suggests that it is possible to scale up life-saving water safety education in a resource-constrained setting, provided the program is flexible enough to adapt to local needs and resilient enough to survive crises like the global pandemic.

The story of this program begins with a simple but difficult reality: over 90 percent of children in Vietnam aged six to fifteen cannot swim, and many live near ponds, rivers, or uncovered water jars that pose a constant danger. To address this, the Vietnamese government, working with international partners, launched a program that offered free survival swimming courses for children aged six to fifteen. The goal was not to create competitive athletes, but to teach a specific set of survival skills: swimming twenty-five meters and floating for ninety seconds. Alongside the swimming lessons, the program brought classroom education on water safety to schools and trained parents of younger children on how to supervise their kids and remove hazards from their homes. The researchers wanted to know if this approach could work on a national scale, so they tracked the program from 2018 to 2022 across eleven provinces, comparing the results to fifteen similar districts where the program was not implemented.

The results of this massive effort were striking. The program reached nearly 373,400 children, which represented about four percent of the total child population in the target age group across the eleven provinces. While this might sound small, for a complex, hands-on safety program, it was a significant achievement. More importantly, the program worked. In the districts where the swimming and safety education took place, the rate of drowning deaths dropped significantly over the five years. The researchers calculated that for every 100,000 children, the program prevented approximately thirty-two deaths compared to what would have happened without it. In the areas without the program, the number of drowning deaths did not show a similar downward trend, suggesting that the improvement was directly linked to the intervention. The children who took the courses were highly successful at learning the skills; after a second chance at the test for those who failed the first time, more than 93 percent of participants could swim the required distance and float for the required time.

One of the most compelling aspects of the study was how the program was delivered. Instead of relying on a small team of foreign experts, the project trained local physical education teachers to become instructors. This "train the trainer" model allowed the program to expand rapidly from eight provinces to eleven, creating a workforce of over 840 certified swimming instructors and 720 water safety educators. This approach proved to be a key factor in the program's success, demonstrating that local communities could be empowered to deliver complex health interventions effectively. The program also maintained an incredibly high standard of safety, with a strict ratio of two instructors and one supervisor for every class, resulting in zero reported safety incidents during the entire five-year period.

However, the path to success was not a straight line. The researchers observed a significant gap in who the program reached. While it was very successful at enrolling children aged nine to eleven, it struggled to get younger children, aged six to eight, into the water. The physical demands of the survival curriculum, which required swimming a long distance and floating for a long time, proved too difficult for the youngest participants. This highlighted an important lesson for future efforts: to be truly equitable, safety programs may need to offer different levels of training, perhaps starting with water familiarization for the very young before moving to full survival skills. The study also showed that the program was remarkably resilient. When the COVID-19 pandemic hit and forced schools to close, enrollment plummeted by 94 percent in 2021. Yet, once restrictions were lifted, the program bounced back quickly, with enrollment in 2022 surpassing pre-pandemic levels. This "V-shaped" recovery suggested that because the program relied on local teachers and local infrastructure rather than a centralized external team, it could pause and restart with ease.

Perhaps the most surprising finding concerned the future of the program. For years, it has been assumed that such safety initiatives in low-income countries must rely entirely on donor money to survive. This study challenged that idea by asking parents if they would be willing to pay for the courses in the future. At the start of the project, very few parents were willing to pay anything. By 2022, after seeing the value of the program, the proportion of parents willing to pay a modest fee of about twenty dollars for a course had risen dramatically. This shift suggests a new path forward: a "socialization" model where the government supports the poorest areas, but wealthier communities and parents contribute to the cost, allowing the program to become a sustainable public service rather than a temporary project.

The researchers were careful to note that while the results were strong, the study had limitations. The districts chosen for the program were not picked at random but were selected because they had high drowning rates to begin with, which means the exact number of lives saved is an estimate. Additionally, some data collection was delayed by the pandemic. Despite these caveats, the evidence points to a clear conclusion: it is possible to scale up drowning prevention in a low-resource setting and save lives. The key lies in training local people, adapting the curriculum to reach the most vulnerable children, and building a system that communities are willing to fund and maintain. By moving from a donor-dependent model to one where local ownership and co-funding play a central role, Vietnam has provided a blueprint for how other nations might tackle this critical public health issue. The work shows that with the right approach, the gap between a life-saving idea and a life-saving reality can be bridged.