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Further sub-analysis compared the proportion of low magnesium concentrations ≤1.6 mg/dl in 2010–2013 to those in 2014, and separately to those in 2015–2016, showing a gradual and consistent increase (Table 2) as more DSW was introduced. Comparing 2010–2013 to 2015–2016 showed a 24% increase in the proportion of low serum magnesium concentrations ≤1.6 mg/dl (p = 0.0019).

Table 2

Changes over time in the proportion of magnesium concentrations ≤1.6 mg/dl in communities where DSW was introduced in 2013

Time periodProportion of Mg ≤ 1.6 mg/dl
2010–2013 **1.62% 
2014–2016 1.81%* 
2015–2016 **2.01% 
Time periodProportion of Mg ≤ 1.6 mg/dl
2010–2013 **1.62% 
2014–2016 1.81%* 
2015–2016 **2.01% 

*p = 0.0057.

**p = 0.0019.

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