CRP and delirium: The reduced set of 27 candidate predictors included demographic characteristics: age and gender; symptoms: cough, fever and delirium; physiological measures and vital signs: BMI, systolic blood pressure, diastolic blood pressure, heart rate, temperature, respiratory rate, oxygen saturation, FiO2 and chest X-ray; frailty score; Glasgow Coma Scale score; laboratory test results: eGFR, pH, base excess, lymphocytes, neutrophil:lymphocyte ratio, haemoglobin, bicarbonate, C reactive protein, alanine aminotransferase, urea and lactate.