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To describe clinical associations of delirium in hospitalized patients and relationships to on admission presentation.

Retrospective analysis of an administrative hospitalization database 1998–2007.

Acute care hospitalizations in the New York State (NYS).

Four categories of diagnosis related group (DRG) hospitalizations were extracted from a NYS administrative database: pneumonia, congestive heart failure, urinary tract/kidney infection (UTI), and lower extremity orthopedic surgery (LEOS) DRGs. These hospitalizations were examined for clinical associations with delirium coding both on and after admission.

Delirium was coded in 0.8% of the cohort, of which an on admission diagnosis was present in 59%. On admission delirium was strongly associated with dementia (adjusted odds ratio 0, 95%CI 5.8–6.3) and with adverse drug effects (ADEs) (adjusted odds …