Stone incidence as related to water hardness in different geographical regions of the United States.
A survey of 1974 discharge data from United States hospitals shows an apparent increase in urolithiasis. A negative correlation has been found between the geographical distribution of the relative frequency of hospital discharges, a diagnosis of urolithiasis, and reported water hardness.
D006801:Humans; D014481:United States; D014545:Urinary Calculi / Q000453:epidemiology*; D014881:Water Supply