The researchers determined the 2007 costs incurred by the people surveyed for general health care service use and lost wages due to illness. Health care service use included visits to psychiatrists, general practitioners, psychologists, social workers, and physiotherapists, as well as days of hospitalization and prescription drugs used. The average cost for all subjects was $3,641. But subjects who scored high on the neuroticism scale cost considerably more than the average. The excess cost above the $3,641 average for the 25 percent group was $5,572, the excess cost for the 10 percent group was $8,243, and the excess costs for the 5 percent group was $12,362.