Model 3, which included comprehensive adjustments for demographic characteristics, vital signs, laboratory parameters, comorbidities, illness severity scores, and treatment measures, demonstrated consistent results (OR = 1.33, 95% CI: 1.05–1.68), with a significant trend across calcium categories (P for trend = 0.017).
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Association between serum calcium levels and the risk of invasive mechanical ventilation in COPD: a retrospective cohort study.
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