Worldwide, the incidence of<unk>  is estimated to be 131 million cases per year. In 2014, the incidence of<unk>  was estimated to be 439 cases per 100,000 individuals in the United States. The incidence of<unk>  in women has increased greatly between 1987 and 2003, from 79 to 467 cases per 100,000 individuals. Almost two-thirds of new<unk><unk> s occur among youth aged 15-24 years. It is estimated that 1 in 20 sexually active young women aged 14-24 years has<unk> . Females are more commonly affected with<unk><unk>  than males. The female to male ratio is approximately 1.52 to 1. The prevalence of<unk>  among non-Hispanic African Americans is 6.7 times the prevalence among non-Hispanic Whites.
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