Changes of egg positive rates of Clonorchis sinensis (Cs) by strategies, 2001-2004.

MT2, mass treatment every 2 year; MT1, mass treatment every year; ST1, selective treatment every year; ST1R, selective treatment and reservoir control every year; ST6M, selective treatment every 6 month; ST2-mod, selective treatment every 2 year; ST1-mod, selective treatment every year.1Cs prevalence rate (PR) for 1 year, weighted by age and sex of total population.2POR (95% CI) of each strategy relative to ST 1 year was computed by multivariate logistic model adjusted for age, sex and the prevalence in 2001.3p-value adjusted for age, sex and the prevalence in 2001 and corrected by Bonferroni's multiple comparison method.4Control efficacy = [PR in 2001 - PR in 2003 or 2004]/PR in 2001.5Mean prevalence rate for 1 year.6Not available.