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Cummulative Incidence Rate of dental caries from intervention of sodium fluoride in water supply :
[a/(a+b)] x 100%=e%

Cummulative Incidence Rate of dental caries from intervention of no sodium fluoride in water supply :
[c/(c+d)] x 100%=f%

If significantly different e% < f%, sodium fluoride in water supply is succesful in the prevention of dental caries.