The purpose of this study is to demonstrate clinical usefulness of Minnesota Multiphasic Personality Inventory in evaluating the treatment effect in chronic pain patients.

The subjects of this study were 56 patients with chronic pain ; 28 patients with organic pain and 28 patients with functional pain from January 1, 1993 to September 30, 1993.

The goal of treatment is decrement of pain, restoration of function, maintance of muscle power and endurance, and achievement of vocational activity by multidiscriplinary approach(pharmacological treatment, physical therapy, muscles re-education exercise, acupuncture therapy, psychosocial therapy). The average treatment length was 5.2 months.

We had repeated MMPI one time by the patients with above treatment goals.

The results were as follows:

1) The pretreatment mean hypochondriasis, depression, hysteria scores were 65.2⁑10.9, 60.4⁑12.8 and 59.8⁑10.9, respectivly.

2) The posttreatment mean hypochondriasis, depression, hysteria scores were 50.5⁑9.8, 48.3⁑9.6 and 46.3⁑9.6, respectivly.

3) The hysteria score of women was significantly higher than that of men before treatment.

4) The hypochondriasis, hysteria scores of unlabor group of unlabor group was significantly higher than that of labor group.

The pretreatment MMPI characteristic T-score showed decrement markedly in the patients who had showed clinically improvement.

The MMPI study can be easily tested and is an important tool in evaluating the treatment effect in patients with chronic pain.