medical documentation hard water and health

There are a lot of iformation in Europe journals and universities not here in USA. here is only one of the preview. It is not public information.

ébastien Marque1, Hélène Jacqmin-Gadda1, Jean-Francois Dartigues1 and Daniel Commenges1
(1)  INSERM U330, Universite de Bordeaux II, 146 rue léeo Saignat, 33076 Bordeaux Cedex, France
Abstract  
Background: Previous studies found relations between
cardiovascular mortality and minerals in drinking water, but the major
works considered water hardness or neglected the differences between
adults and elderly. Drinking water is an important source of calcium in
the elderly particularly because of increased needs and decreased
consumption of dairy products. Methods: We collected
informations about all deaths (14,311) occurring in 69 parishes of the
South–West of France during 7 years (1990–1996). We obtained the causes
of deaths from a special service of INSERM for each death, with age at
death and sex. The exposure value was supplied by administrative source
(DDASS) and by measurement surveys. We use an extra-Poisson variation
model to take into account the heterogeneity of the population of these
parishes. Results: A significant relationship was observed
between calcium and cardiovascular mortality with a RR: 0.90 for
non-cerebrovascular causes and RR: 0.86 for cerebrovascular (when
calcium is higher than the second tercile: 94 mg/l). We found a
protective effect of magnesium concentrations between 4 and 11 mg/l
with a RR: 0.92 for non-cerebrovascular and RR: 0.77 for
cerebrovascular mortality, as compared to concentrations lower than 4
mg/l. Conclusions: These findings strongly suggest a potential
protective dose-effect relation between calcium in drinking water and
cardiovascular causes. For magnesium, a U-shape effect is possible,
especially for cerebrovascular mortality.

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