Question

table below

Status as Adolescents / No. of Participants / Deaths from CHD

Overweight / 238/ 40

Lean/ 270/30

Based on the table below, calculate and interpret the relative risk of CHD death associated with overweight status as adolescents compared to lean adolescents. Status as Adolescents No. of Participants Deaths from CHD Overweight 238 40 Lean 270 30

a )The CHD rate is 1.55 times greater for overweight adolescents compared to lean adolescents.

b) The CHD rate is 1.32 times greater for overweight adolescents compared to lean adolescents.

c) The CHD rate is 0.65 times less for overweight adolescents compared to lean adolescents.

d) The CHD rate is 1.67 times greater for overweight adolescents compared to lean adolescents.

Answer 1

Putting the given data into a table

	Overweight	Lean
Death	40 (a)	30 (b)
Otherwise	198 (c)	240 (d)
Total participants	238 (a+c)	270 (b+d)

The relative risk of CHD in Overweight adolescents can be calculated by Cross product ratio /odds ratio with the table

Odds ratio = (a*d) /(b*c) = (40*240)/(198*30) = 9600/5940 ~ 1.62

Hence the overweight adolescents are at 1.62 times more risk at dying due to CHD than lean adolescents

Hence the most appropriate option would be Option D