Pain
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Visual analogue scales (VAS) of sensory intensity and affective magnitude were validated as ratio scale measures for both chronic and experimental pain. Chronic pain patients and healthy volunteers made VAS sensory and affective responses to 6 noxious thermal stimuli (43, 45, 47, 48, 49 and 51 degrees C) applied for 5 sec to the forearm by a contact thermode. ⋯ The power functions were predictive of estimated ratios of sensation or affect produced by pairs of standard temperatures (e.g. 47 and 49 degrees C), thereby providing direct evidence for ratio scaling properties of VAS. Vas sensory intensity responses to experimental pain, VAS sensory intensity responses to different levels of chronic pain, and direct temperature (experimental pain) matches to 3 levels of chronic pain were all internally consistent, thereby demonstrating the valid use of VAS for the measurement of and comparison between chronic pain and experimental heat pain.
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Cognitive and behavioral pain coping strategies were assessed by means of questionnaire in a sample of 61 chronic low back pain patients. Data analysis indicated that the questionnaire was internally reliable. ⋯ These 3 factors were found to be predictive of measures of behavioral and emotional adjustment to chronic pain above and beyond what may be predicted on the basis of patient history variables (length of continuous pain, disability status, and number of pain surgeries) and the tendency of patients to somaticize. Each of the 3 coping factors was related to specific measures of adjustment to chronic pain.