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As a basis for this book, it was thought necessary to investigate a large number (50,000) of histories of accidents and to trace them from the date of injury to the time of resumption of full work. This investigation was required on account of the differences of opinion expressed by medical witnesses when asked at law courts to give a prognosis in cases of injury. The hospital surgeons generally give a much more favorable prognosis than the panel doctor (general practitioner), because the surgeon bases his prognosis on the length of time before the man will be discharged from treatment and the panel doctor on the length of time for which he will have to give certificates before the man ultimately resumes his work. One large insurance company anonymously opened its books for the purpose of this author's statistical study. The first part of the book describes disabilities following injuries
Injury and Incapacity with Special Reference to Industrial Insurance. JAMA. 1936;106(5):408. doi:10.1001/jama.1936.02770050064027