Sir.—I applaud the attempts of Chan et al1,2 to estimate the influence of dietary calcium on bone health in children and adolescents. There has been a long-standing controversy about recommended levels of dietary calcium for children and adolescents. We recently conducted a study of calcium intake and epidemiologic characteristics of fractures in schoolchildren, and in analyzing the results came to some interesting conclusions. Some of the conclusions were similar to those expressed by Chan, and some were not.
Patients Reports.—In the island of Majorca, Spain, we selected three towns (Andraitx, Palma, and Felanitx) for study. We selected these towns because (1) the residents of each town had the same socioeconomic background; (2) since 1984 the fluorine content in tap water was always <0.5 mg/L; and (3) the water supplies in each town contained very different levels of calcium during the 7-year period for which data were available.