Comparison between CBVD mortality rate and the percentage of death from 1994-2003 and the mean concentration of calcium and magnesium, as well as the hardness in Decatur County, are given in Table V.
Table VI gives the summary of correlation coefficient obtained when the mortality rates due to CBVD and concentrations of calcium, magnesium and hardness of waters are plotted in Figures 6A, 6B, 7A, 7B, 8A, and 8B for the drinking waters of Decatur County by regions.
Table VI: Correlation between cerebrovascular disease mortality rate in Decatur County Georgia and concentrations of calcium, magnesium and water hardness Decatur County Drinking Water Correlation Hardness Of Calcium Magnesium Coefficient Water All Regions 0.2021 0.5476 0.0119 Excluding SW 0.4067 0.6069 0.5414 Region An inverse correlation (0.4067) is observed between water hardness and the mortality rate from CBVD in all regions except for the southwestern area.
In this study, we used drinking water samples from Decatur County to evaluate the role of soft and hard water (sum of the concentrations of calcium and magnesium) on cardiovascular diseases (CVD and CBVD) mortality.
It is observed that the incident of CVD and CBVD are the lowest in the county (Table V).
A statistically significant link between water hardness, calcium, magnesium and mortality from CBVD is demonstrated in our study (Table VI, Figures 6, 7 & 8) of Decatur County unlike the study (14) of North Dakota drinking waters where they only found a statistically slightly significant link between water hardness and geographical differences in mortality from CBVD.
In this study, we found that the concentrations of magnesium showed positive correlation to CBVD mortality rate.