Trends in U.S. adolescent physical activity and obesity: A 20‐year age‐period‐cohort analysis
Authors' conclusion
The reversal of obesity trends by age with little change in physical activity over the study period suggests other lifestyle factors have changed over the study period to increase the prevalence of obesity in older adolescents.
Study context
- Population
- US adolescents aged 14–18 years, Youth Risk Behaviour Surveillance System, 1999–2019
- Participants
- 144,544 adolescents
- Outcome
- Trends in physical activity and BMI
- Follow-up
- 1999–2019
Methodological detailsmultilevel linear and logistic regression
- Multilevel linear and logistic regression
Main finding
As reported in the abstract
- Age and period effects are strong in all outcomes studied
- Physical activity consistently decreases with age across the study period
- Age trends in obesity have reversed in recent years; older adolescents now more likely to have obesity than younger
- Female and Asian adolescents report less physical activity but lower obesity rates than male and non-Asian counterparts
Observational data: associations, not effects.
Original publication
Trends in U.S. adolescent physical activity and obesity: A 20‐year age‐period‐cohort analysis. Pediatr Obes. Published 14 December 2022. doi:10.
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