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    Can someone please help me with how to get these figures for this question...

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    The risk of men to develop heart disease for the group of 75 and older is calculated by the incidence of men with heart disease divided by population, so it would be 420/1000. That is the number of men in the 75+ group who have heart disease for every 1000 of the population. Similarly, for the incidence of men with heart disease in 18-44 group, it is calculated by the incidence divided by the population. So it would be 30/1000.

    The title of the y axis tells you the population size which they are using which is 1000. Looking at the intervals on the y axis, from 0 to 100 there are 5 lines so 100/5 =20, so each line represents 20 people with heart disease. From here you multiply 20 by the line in which you want to find. In the exmaple of the group of 75+, that bar ends on the 21st line, so 21x20 = 420. You do the same for the 18-44 group. Hopefully this helps.
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    (Original post by BrwnSugR1)
    The risk of men to develop heart disease for the group of 75 and older is calculated by the incidence of men with heart disease divided by population, so it would be 420/1000. That is the number of men in the 75+ group who have heart disease for every 1000 of the population. Similarly, for the incidence of men with heart disease in 18-44 group, it is calculated by the incidence divided by the population. So it would be 30/1000.

    The title of the y axis tells you the population size which they are using which is 1000. Looking at the intervals on the y axis, from 0 to 100 there are 5 lines so 100/5 =20, so each line represents 20 people with heart disease. From here you multiply 20 by the line in which you want to find. In the exmaple of the group of 75+, that bar ends on the 21st line, so 21x20 = 420. You do the same for the 18-44 group. Hopefully this helps.
    Thank you!! You explained this very well to me! But am still a little confused as I still don't know why the mark scheme says your answer should be between 11-13. What even is that a measurement of?

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    Actually don't worry I've managed to work it out using your explanation.
    It means you are 11 times more likely to develop the disease as a male when you are 75 or over in comparison to a male who is between the age 18 and 44 years.Therefore is a 38.5% increased chance (42% total chance of developing heart disease as a male at 75 or over, and 3.5% chance of developing the disease between age 18 and 44 years old)
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    Hello, I have taught biological sciences at Manchester and Cambridge and have published work in neuroscience. Please PM me should you require any further biology assistance.
 
 
 
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