IQR = interquartile range; n = number; % = percentage; °F = grade Fahrenheit; CVD = cardiovascular disease; CKD = chronic kidney disease; COPD = chronic obstructive pulmonary disease; PD = parkinson’s disease; SpO₂ = peripheral capillary oxygen saturation; min = minute; PaO₂/FiO₂ = ratio of arterial oxygen partial pressure to fractional inspired oxygen; mmHg = millimetre of mercury; CRP = C-reactive protein; mg = milligram; L = liter; FEU = fibrinogen equivalent units; ng = nanogram; WBC = white blood cells; K/µL = thousand cells per micro liter; LDH = lactate dehydrogenase; U/L = units per liter; dL = deciliter; ALT = alanine aminotransferase; AST = aspartate aminotransferase; MEWS = Modified Early Warning Score.