To address the hazards inherent in construction work, such as trenches, heights, power lines, and dangerous equipment, the Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH) have established specific safety goals, which have contributed to safer working environments in the United States. This attention stems from construction being one of the industries in which workers are most frequently injured or killed. Workers in establishments engaged in construction activities accounted for an average of 1 in 5 on-the-job fatalities and 1 in 10 nonfatal workplace injuries and illnesses. Of those cases involving days away from work, the most common event for workers in private construction was overexertion (20 percent of cases); struck by object (18 percent); and fall to a lower level (14 percent).