Objective. To assess the impact of a web-based intervention supplementedwith textmessages to reduce cancer risk linked with smoking, unhealthy diet, alcohol consumption, obesity, sedentary lifestyle and sun exposure.
Methods. A total of 2001 voluntary adolescents from Spain and Mexico were recruited between 2009 and
2012 and randomly assigned to: one control group and two experimental groups, which received exclusively the online intervention (experimental group 1) or the intervention supplemented with encouraging text messages (experimental group 2). The educational intervention was based on both: successful psychosocial models (i.e. A.S.E. and Transtheoretical model) and the school curriculum.
Results. After a 9-month follow-up, the prevalence of studentswho did not eat fruitwas reduced significantly
in all groups: experimental group 1 (−62.6%), experimental group 2 (−71.5%) and even the control group
(−66.8%). Being overweightwas only reduced in the experimental group 2 (−19.6%). The total cancer behavioral risk score, which ranged from0 to 100 points (highest risk), was significantly reduced in the experimental group 1 (−3.5 points) and in the experimental group 2 (−5.3 points). The text-supplemented online intervention increased the probability of improving the post-test total cancer behavioral risk (OR = 1.62).
Conclusion. The web-based intervention supplementedwith textmessages had a positive global impact, but it lead to only minimal changes in risky behaviors. This intervention appears useful in controlling overweight adolescents.
