the highest-risk groups, the prevalence of stone disease
approached one in five persons. These findings represent a
marked increase in the prevalence of stone disease over the
intervening 15 years: In 1994, the reported prevalence of
stone disease in the NHANES sample was only 5.2% (ie, 1 in
20 persons) [1]. This dramatic increase in the prevalence of
stone disease persisted even after adjusting for the changes
in the US population since NHANES III.