Predicting intention to self-test for chlamydia using theory of planned behaviour and protection motivation theory

Background: Chlamydia is the most commonly diagnosed sexually transmitted infection in the UK. Encouraging self-testing in the general population may facilitate reduced prevalence but little is known about predictors of intention to self-test outside official programmes and there is a lack of research incorporating theory. Methods: People reading about chlamydia testing on the internet were targeted using Google Adwords. They were invited to complete an online questionnaire which included items assessing constructs of the Theory of Planned Behaviour and Protection Motivation Theory. Responses were received from 310 adults agend 16–76 years. Sufficient data for multiple regression analysis were received from 100. Findings: Higher Vulnerability, Response Efficacy and Self-Efficacy predicted intention to self-test (β = 0.37, 0.22, 0.28 respectively; p < 0.05). The overall model was significant (Adj. R 2 = 0.42, p < 0.001). Discussion: Constructs in Protection Motivation Theory predicted intention to self-test. The challenges of accessing people at risk of chlamydia in the general population will be discussed.