In 2013, falls to lower level accounted for 574 fatal work injuries. Of the cases where height of fall was known (466 cases), 3 out of every 5 were falls of 20 feet or less. Only one in five cases involved falls from more than 30 feet. In fact one in ten cases involved falls of less than 6 feet.
Source: U.S. Bureau of Labor Statistics, U.S. Department of Labor, 2014