Effectiveness of a health belief model intervention using a lay health advisor strategy on mouth self-examination and cancer screening in remote aboriginal communities: A randomized controlled trial.

OBJECTIVE: Oral cancers caused by chewing betel nuts have a poor prognosis. Using a lay health advisor (LHA) can increase access to health care among underprivileged populations. This study evaluated a health belief model (HBM) intervention using LHAs for oral cancer screening (OCS) and mouth self-examination (MSE) in remote aboriginal communities. METHODS: The participants were randomly assigned to intervention (IG; n = 171) and control groups (CG; n = 176). In the IG, participants received a three-chapter one-on-one teaching course from LHAs, whereas those in the CG received only a leaflet. RESULTS: The IG participants were 2.04 times more likely to conduct a monthly MSE than those in the CG (95% confidence interval: 1.31-3.17) and showed significantly higher self-efficacy levels toward OSC and MSE (beta = 0.53 and 0.44, effect size = 0.33 and 0.25, respectively) and a lower barrier level for OSC (beta = -1.81, effect size = -0.24). CONCLUSION: The LHA intervention had a significantly positive effect on MSE, strengthening self-efficacy and reducing barriers to OCS among aboriginal populations. PRACTICE IMPLICATIONS: The effectiveness of the clinical treatment of underprivileged group can be improved through early diagnosis, which can be achieved using LHAs to reduce barriers to OSC.