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Cross-sectional observational study with exploratory findings on self-efficacy and metabolic syndrome; authors explicitly state findings are exploratory and require longitudinal confirmation, limiting causal inference.
This is a design paper reporting baseline characteristics of a small RCT (n=66) not yet reporting efficacy outcomes; the trial will generate evidence but no treatment effect data are presented.
Prospective cohort with robust methodology (Cox models, time-dependent ROC, C-index, NRI/IDI) demonstrates TYG-WC as superior predictor of metabolic syndrome incidence with clinically meaningful effect size and excellent discrimination (C-index 0.83) across stratified subgroups.
Rigorous systematic review and meta-analysis of 20 RCTs with pre-registration, low risk of bias in majority of included studies, and high certainty of evidence for primary anthropometric outcomes (BMI, weight), though effect sizes are modest and direct body composition changes were not significant.