 The prevalence of violence against prostitutes varies by location.A study of female prostitutes in Vancouver, British Columbia, Canada over the age of 14 who used illicit drugs other than marijuana found that 57% of prostitutes experienced some form of gender-based violence over an 18-month period.A study of 1,000 female (both cisgender and transgender) sex-workers in Phnom Penh, Cambodia found 93% of women surveyed had been the victim of rape in the past year.