What test can be used to compare the fracture rates in these two communities while controlling for age? 

Endocrinology

A study was performed looking at the risk of fractures in three rural Iowa communities according to whether their drinking water was €œhigher calcium,€ €œhigher fluorides,€ or €œcontrol€ as determined by water samples. Table 13.44 presents data comparing the rate of fractures (over 5 years) between the higher-calcium vs. the control communities for women ages 20€“35 and 55€“80, respectively [44].

Table 13.44: Relationship of calcium content of drinking water to the rate of fractures in rural Iowa

 

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Total number of women Number of women with fractures Number of women with fractures Total number of women Ages Agos 55-80 20-35 Control Control Higher calcium 37 11 121 Higher calcium 148 33 21