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Number of reported partners in the last year (a) and perceived personal risk of acquiring chlamydia ranging from low (0%) to high risk perception (100%) (b) among heterosexuals aged 16–26 years. The dotted line indicates the cut-off point used to define the SB–RP groups in the model population (i.e. 4th quartile of the number of reported partners and the median personal risk estimate for chlamydia of the total population).
