Figure 1.

CSF catecholamine levels were analysed in three cohorts. (A) The hip fracture cohort included patients with and without dementia and delirium. Information about delirium at any time was missing for one patient and delirium status when CSF was obtained was missing for four patients. These patients were excluded from analyses requiring this information. (B) The medical delirium cohort included patients all with delirium due to another medical condition while (C) the final cohort included cognitively normal elderly patients.