“…The aSPR, which is the ratio of the observed number of cases of Vietnamese migrant workers to the expected number of cases obtained through the prevalence rate by age group of the reference population, was calculated. Additionally, 95 percent confidence intervals (95% CI) were calculated using Byar's approximation [ 17 , 18 ]. To ensure accurate prevalence calculations, prevalence was calculated after excluding respondents who answered “I haven't needed a hospital examination” in the case of unmet medical need.…”