CRH and delirium: Subsequent analysis indicated that serum potassium (OR: 0.311, 95% CI 0.103–0.935), sodium (OR: 0.991, 95% CI 0.983–1.000), CRH (OR: 0.964, 95% CI 0.936–0.994), and GLU (OR: 1.654, 95% CI 1.137–2.406) levels in the perioperative period were independent risk factors for delirium.