Given the task definition and input, reply with output. In this task, you are given a passage which has a question and the context. You have to generate an answer to the question based on the information present in the context.

Context: Oxidative stress may be involved in occurrence of postoperative delirium (POD) and cognitive dysfunction (POCD). 8-iso-Prostaglandin F2 (8-iso-PGF2), an isoprostane derived from arachidonic acid via lipid peroxidation, is considered a gold standard for measuring oxidative stress. The present study aimed to investigate the ability of postoperative plasma 8-iso-PGF2 levels to predict POD and POCD in elderly patients undergoing hip fracture surgery.', 'Postoperative plasma 8-iso-PGF2 levels of 182 patients were measured by an enzyme-linked immunosorbent assay. We assessed the relationships between plasma 8-iso-PGF2 levels and the risk of POD and POCD using a multivariate analysis.', 'Plasma 8-iso-PGF2 levels and age were identified as the independent predictors for POD and POCD. Based on areas under receiver operating characteristic curve, the predictive values of 8-iso-PGF2 were obviously higher than those of age for POD and POCD. In a combined logistic-regression model, 8-iso-PGF2 significantly enhanced the areas under curve of age for prediction of POD and POCD.\Question: Are postoperative plasma 8-iso-prostaglandin F2 levels associated with delirium and cognitive dysfunction in elderly patients after hip fracture surgery?
Postoperative plasma 8-iso-PGF2 levels may have the potential to predict POD and POCD in elder patients undergoing hip fracture surgery.