title: Toward a practical instrument system for the automatic measurement of "up-time" in chronic pain patients.
abstract: A portable low-cost instrument system for reliable and automatic measurement of "up-time" in chronic pain patients was described. The system used a miniature electronic stopwatch/calculator to accumulate up-time. A mercury tilt switch mounted on the outer thigh was used to control time accumulation. Performance assessment showed excellent reliaility, as well as high concurrent validity (r = 0.999) for the system. Initial field testing with normal subjects and chronic pain patients indicated reliable and easy operation.
mesh_terms: D001521:Behavior Therapy / Q000295:instrumentation*; D006801:Humans; D010148:Intractable Pain / Q000503:physiopathology / Q000628:therapy*; D012647:Self-Assessment