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. 2018 Apr 28;8(4):e019223. doi: 10.1136/bmjopen-2017-019223

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This displays the mean frequency of variable use in the 14 externally validated delirium prediction models. ‘(P)’ indicated a precipitating risk factor used in a delirium prediction model. The following variables were used twice and are not represented in the figure: BUN/Cr ratio (Blood Urea Nitrogen/Creatinine ratio), comorbidities, history of delirium, depression, medications (1: upon admission, 1: added during hospital stay), restraint use and malnutrition (1: altered albumin level, 1: malnutrition scale). The following variables were used once and are not represented in the figure: bladder catheter use, C reactive protein, emergency surgery, presence of fracture on admission, history of cerebrovascular accident, iatrogenic event, intensive care unit admission and open surgery.