Impact of the POPulation Medicine Multimorbidity Intervention in Xishui County (POPMIX) on people at high risk for COPD who smoke: protocol for the POPMIX-Smoking cluster randomised controlled trial.

BMJ Open · 2026 · PMC13150926 · PMID 42091148

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a positive trendno p-value reported

If a positive trend is observed but statistical significance is not reached, the trial should continue as planned to determine the robustness of the effect.

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