Hammonds W, Brena S F, Unikel I P
South Med J. 1978 Jun;71(6):664-5. doi: 10.1097/00007611-197806000-00017.
A group of 61 patients with problems of chronic pain were managed though a rehabilitation program based on the principles of operant conditioning. Of these patients, 35 were receiving compensation for work-related accidents, and 26 were receiving no financial compensation for their chronic pain. Of the patients not receiving compensation, 69% (18) made significant increases in their functional performances, while only 43% (15) of the compensation group made similar increases.
