Question

A study was conducted comparing the risk of hip fracture in women according to body mass index (BMI) over 10 years. Women with a high body mass index (BMI) had a risk of 60, women with a normal BMI had a risk of .55, and women with a low BMI had a risk of .20

Please show details of how you got your answers

a. What was the Risk Difference (RD) comparing women with a low BMI to women with a normal BMI over 10 years? (2 points)

Interpret result (1pt):

b. What was the Risk Difference (RD) comparing women with a high BMI to women with a normal BMI over 10 years? (2 points)

Interpret result (1pt)

3. What was the Risk Ratio (RR) comparing women with a normal BMI to women with a low BMI over 10 years? (2 points)

Interpret result (1pt):

4. What was the Risk Ratio (RR) comparing women with a high BMI to women with a normal BMI over 10 years? (2 points)

Interpret result (1pt):

Answer 1

A.

RD = 0.2 - 0.55

= -0.35

i.e. there is 35% less risk of hip fracture in women with a low BMI to women with a normal BMI over 10 years.

B.

RD = 0.6 - 0.55

= 0.05

i.e. there is 5% more risk of hip fracture in women with a high BMI to women with a normal BMI over 10 years.

C.

RR = 0.55/0.2

= 2.75

i.e. there is 2.75 times the risk of hip fracture in women with a normal BMI to women with a low BMI over 10 years.

D.

RR = 0.6/0.55

= 1.091

i.e. there is 1.091 times the risk of hip fracture in women with a normal BMI to women with a low BMI over 10 years.

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