The nurse is admitting a 70-year-old patient for a procedure. The patient has type I diabetes mellitus with significant peripheral neuropathy, atrial fibrillation controlled with antiarrhythmic medications, and osteoarthritis bilaterally in his knees. He is also on anticoagulants with an INR of 3.0. Given that the nurse knows about the individual risk factors that raise the risk of a fall, accident, or injury while hospitalized, which of the following should be identified as the most significant risk factor for this patient?