5th June 2023

A 60-year-old man is admitted to the orthopaedic ward after a fall, sustaining a neck of femur fracture

A 60-year-old man is admitted to the orthopaedic ward after a fall, sustaining a neck of femur fracture. He undergoes a total hip arthroplasty. Prior to this admission, he was living at home independently, and his only past medical history was well-controlled asthma and hypertension.

Which of the following options is his most significant risk factor for developing delirium?