Figure 13

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Bar graph showing the proportion of STD clinic patients testing positive for chlamydia by age group and sex and sex of sex partners. In 2018, the proportion of STD clinic patients testing positive for chlamydia varied by sex and sex of sex partners, as well as age. Women and men who have sex with women only aged 19 years or younger had the highest positivity; positivity was nearly equal at 30.6% and 30.5%, respectively. Positivity among all those tested decreased with age, though the decrease in positivity by age was not as pronounced for men who have sex with men. The overall positivity, represented by the average of the mean value by the contributing SSuN jurisdictions, was 16.9% for men who have sex with men, 13.8% for men who have sex with women only, and 10.9% for women.