Objective To assess the association between chlamydia (CT)-test results and subsequent sexual risk behaviour change in a register based Chlamydia Screening (CSI) programme consisting of four screening rounds.
Methods All participants in the CSI programme, who had completed questionnaires and corresponding CT-test results in ≥ 2 rounds, were included. Measurements in round four were excluded, because of low participation rates. Sexual risk behaviour parameters contained the use of condoms, number of partners and having casual, concurrent or new partners. Generalised estimating equations (GEE) were used to assess the influence of the test result on the change in sexual risk behaviour in the subsequent round. Analysis were adjusted for sexual preference, having a steady or casual partner, age and number of rounds participated.
Results Of 9360 included participants, 80.5% (n = 7536) and 19.5% (n = 1824) completed CT-testing and questionnaires in respectively two and three rounds. Across all rounds, a significant difference in change of sexual risk behaviour could be found: participants who tested CT-positive in the previous round more often reported reduced risk behaviour (more use of condoms with a casual partner (32.1% vs 24.1%, p = 0.018), less having sex with a casual partner (21.7% vs 15.3%, p = 0.001), lower number of sex partners (38.5% vs 24.7%, p < 0.001), less having sex with concurrent partners (15.3% vs 8.9%, p = 0.005) and less having new sex partners (21.0% vs 16.3%, p = 0.010)) compared to participants who tested CT-negative in the previous round. No significant difference in change of the use of condoms with a steady partner (p = 0.926) was found between participants who tested positive and participants who tested negative in the previous round.
Conclusion Sexual risk behaviour change was associated with previous CT-test results. Participants who tested CT-positive more often positively changed their sexual risk behaviour compared to participants with a negative test result in the previous round.
- chlamydia screening
- sexual risk behavior
- test result