PRL and delirium: Routine blood variables (i.e., album (ALB), serum chloride ion, serum potassium ion, serum sodium ion, glucose (GLU)) and hormonal variables (i.e., thyroid‐stimulating hormone (TSH), tetraiodothyronine (T4), corticotropin‐releasing hormone (CRH), insulin‐like growth factor 1 (IGF‐1), growth factor (GH), prolactin (PRL), follicle‐stimulating hormone (FSH), estradiol (E2)) were compared between the delirium and nondelirium groups.