Line chart showing the rate of chlamydia notifications, with 95% confidence intervals, over the study period for males in the age categories 15-29 years, 30-44 years, 45-59 years and 60 years and over. Rates were significantly higher among males aged 15-29 years and increased over the period from 189 per 100,000 in 2003 to 640 per 100,000 in 2012 before slightly declining in 2013. A particularly steep rise was observed in 2010, 2011 and 2012. Notification rates among males of older age groups increased slightly or remained relatively stable over the period.