P1‐267: CEREBROSPINAL FLUID/PLASMA ALBUMIN RATIO PREDICTS POSTOPERATIVE DELIRIUM IN AN OLDER ELECTIVE ORTHOPAEDIC POPULATION. (1st July 2006) - Cunningham, Emma L.; Passmore, Anthony Peter; McAuley, Daniel F.; Beverland, David; Mawhinney, Tim; O'Brien, Seamus; Toombs, Jamie; Schott, Jonathan M.; Zetterberg, Henrik; Lunn, Michael; McGuinness, Bernadette