 Physical violence is defined by the World Health Organization as "the intentional use of physical force or power, threatened or actual, against oneself, another person, or against a group or community, which either results in or has a high likelihood of resulting in injury, death, psychological harm, maldevelopment, or deprivation".Physical violence is more commonly experienced by outdoor prostitutes with 47% of prostitutes working outdoors reporting being kicked, punched, or slapped in one study.In a study of prostitutes working in San Francisco, 82% of participants reported having experienced some type of physical violence since entering prostitution, with 55% of these assaults being committed by a client.