Each patient's age, sex, race, blood pressure, and education were recorded along with symptoms, such as depression, agitation, feelings that others wanted to harm him or her, wandering, unsteadiness in walking, tendency to fall down, and involuntary loss of urine. Loss of mental function was evaluated by using a standard test known as the Mini-Mental State Examination (MMSE). A doctor then examined the patient and recorded specific abnormalities of the brain and spinal cord. The researchers calculated the percentage of patients who died within a given period according to what symptoms they had at the beginning of the study. Because the researchers were also interested in evaluating whether rapidity of loss of mental function was important in determining survival time, they repeated the MMSE and calculated the change in MMSE score at the end of 1 year of observation.