Abstract Background Sentinel surveillance of Keshan disease (KD) is limited by unable to
give the prevalence rates and their estimates. This study was to find the national KD
prevalence and the estimated patient numbers to provide evidence toward modifying the
policy of KD prevention and control. Method Using a probability proportional to population
size, randomized, multistage, and cluster sampling, we surveyed 101,127, measured grain
selenium levels; and surveyed household income with pre-designed questionnaires …