Time-varying effects of a text-based smoking cessation intervention for urban adolescents.

摘要: Abstract Introduction Craving to smoke is understood as an important mechanism for continued smoking behavior. Identifying how interventions operate on craving with particular populations critical advancing intervention science. This study's objective was investigate the time-varying effect of a text-delivered cessation intervention. Methods Toward this end, we used ecological momentary assessment (EMA) data collected from five-day, automated text-messaging randomized clinical trial 200 urban adolescents. We employed model (TVEM) estimate effects stress (time-varying covariate) and baseline nicotine dependence level (time-invariant over six months by treatment condition. The TVEM approach models behavioral change associations coefficients expressed dynamically graphically represented smooth functions time. Results Controlling gender, age, current smoking, differences in trajectories between control conditions were apparent course study. During 2 3, association significantly stronger among group, suggesting dampens during time period. also reduced salience adolescents, being steadily time, while group increased Conclusions These results provide insight into nature adolescents receiving text-based ability specify when strongest developing targeted adaptive that can adjust strategically