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A study was conducted in Ghana to find out if there was an association between daily fibre intake and colon cancer. Two hundred (200) adults with high fibre diets were recruited and followed for 840 person years, of which 20 developed colon cancer. One hundred and fifty (150) adults with moderate fibre intake were also followed for 900 person years and 30 developed colon cancer. Fifty (50) adults with low fiber intake were followed for 450 person years, 15 developed colon cancer.
Calculate the incidence ratio (IR) of colon cancer among adults with high, moderate and low fibre intake. (6 marks)
Assuming that high fibre intake is the reference group, compare the rate ratio (RR) of moderate fibre intake and low fibre intake and interpret the findings. (5 marks) ​

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