Movimente program: effectiveness and moderators of a cluster-randomized controlled trial on self-reported physical activity among Brazilian adolescents
Bibliographic record
Abstract
BACKGROUND: School-based intervention are needed due to the low levels of physical activity among adolescents. OBJECTIVE: To evaluate a school-based intervention's effectiveness and potential sociodemographic moderators on physical activity (PA) among Brazilian adolescents. DESIGN: The Movimente Program was a cluster randomized controlled trial conducted at six elementary schools in southern Brazil in 2017. METHODS: Participants (n = 921) were adolescents from 7th -9th grade (12 to 15 years). From March to December, intervention strategies included teacher training, educational actions, and environmental improvements designed to increase PA levels. PA was self-reported, and the primary outcome was weekly minutes in total PA; secondary outcomes were weekly minutes in leisure-time PA, adherence to guidelines, and diversity (e.g., number of activities). In addition, the moderation effect of sex, school grade, socioeconomic level, weight status, and baseline PA levels was explored. Mixed-model linear regressions were used to test changes between baseline and follow-up (difference-in-differences approach). RESULTS: Participants were, on average, 13.1 ± 1.1 years old, and 52% were female. Pre-post changes in PA volume did not differ between intervention and control groups (β: 6.64; 95% CI: -104.60; 117.89), nor did adherence to guidelines. No significant interaction effects of sex, socioeconomic level, or weight status were found. Pre-post changes of leisure PA diversity favored the intervention group among 8th but not 7th and 9th grade students. CONCLUSION: The Movimente Program was not effective in improving PA among the whole sample. Further studies are warranted to explore effective ways to improve PA among adolescents from Brazil. TRIAL REGISTRATION: The research project is registered with Clinical Trials (NCT02944318 Date of registration 25/10/2016).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.006 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.002 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".