GSTM1 and delirium: The scoring system, which was based on five clinical characteristics, namely age > 75 years, history of stroke, preoperative Hb ≤ 100 g/L, preoperative PaO2 ≤ 70 mmHg, and time between admission to surgery > 3 days, seems to achieve satisfactory sensitivity and specificity in predicting postoperative delirium after intertrochanteric fracture surgery in elderly patients.