Line chart showing the rate of chlamydia notifications, with 95% confidence intervals, over the study period for females in the age categories 15-29 years, 30-44 years, 45-59 years and 60 years and over. Rates are significantly higher among females aged 15-29 years and increased over the period from 332 per 100,000 in 2003 to 1006 per 100,000 in 2012 before falling slightly in 2013. A particularly steep rise was observed in 2010. Notification rates among females of older age groups remained relatively stable over the period.