What type of study is this?

This is a Cohort Study study (also classified as: Logistic Regression, Cox Regression).

September 10, 2025BMC Pulmonary MedicineOpen Access

Association of altitude and eosinophil with the one-year mortality of acute exacerbation of chronic obstructive pulmonary disease: a cohort study

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Patients at high altitude experienced significantly higher one-year mortality compared to those at low altitude.
Logistic and Cox regression analyses revealed altitude and eosinophil were significant factors affecting mortality risk.
The study followed 351 AECOPD inpatients over one year, with key variables including age and CRP levels.
Findings suggest that eosinophil levels may have protective effects against mortality in COPD at high altitude.

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Cohort study shows higher one-year mortality in COPD patients at high altitude, indicating eosinophil association.

Li et al. (2025) studied this question.

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