Selection Bias Selection bias occurs when the selection of participants in one group results in a different outcome than the selection for the other group
1 As of 2015, there are more than 96,000 osteopathic medical physicians in the United States.  By 2020, the number of osteopathic medical physicians will be over 100,000, say expert predictions, according to the American Medical Association.
The BLS expects the total number of positions available for physicians to increase from 691,300 to 859,300 between 2010 and 2020. Due to the potential for higher earnings, the majority of these doctors will work in specializations instead of general medicine.