Cumulative <i>C. trachomatis</i> seroprevalence by birth cohort within three age groups.

<p>Missing bars occur where years of birth were not represented in the samples (selected by age and year of collection).</p

Seroprevalence of <i>C. trachomatis</i> antibody by age group and year of sample collection.

a<p>Score test for trend.</p>b<p>17–18 year olds, 20–21 year olds and 23–24 year olds combined. For continuity of data in this table, and because they are not very meaningful as single-year age groups, we do not show the data for 19 and 22 year olds.</p>c<p>Prevalence age standardised to ONS 2004 population.</p