Exploring the association between medication, patient-specific factors and delirium in hospitalised patients: a 10-year retrospective, population-based cohort study in Iceland.

The cohort comprised 55 495 patients (51.5% male) with a median [IQR] age of 71 years [58, 82].

Throughout the study, 3533 patients were diagnosed with delirium at least once over the 10-year study period.

A statistically significant association (χ 2 test, p <0.001) between the delirium (n=3533) and the non-delirium group (n=51 926) was identified for hyperpolypharmacy (≥10 medications), prescribed proton pump inhibitors, opioids, beta-lactam antibiotics, anticoagulants, statins and selective beta-blockers.