MI no MI Total Statins 95 2781 2876 No Statins 89 2028 2117 (Use Table 1) – Two
ID: 3238009 • Letter: M
Question
MI
no MI
Total
Statins
95
2781
2876
No Statins
89
2028
2117
(Use Table 1) – Two of the statements below are correctly calculated and worded, and can be calculated using only the information in Table 1Which two are correct? A correct result could be stated as a decimal, as a percent, or as so many per thousand. Choose the 2 most correct statements below.
a) The relative risk of MI while taking statins is 0.044.
b) The relative risk of MI for non-statin users as compared with statin users is 0.773.
c) The risk ratio of MI for statin users as compared with non-statin users is 0.773.
d) The population attributable risk for MI due to statins is less than 2%.
e) The reduction in risk of MI attributable to statins in more than 25%.
f) The risk of MI while taking statins is 33 per 1,000.
g) The risk of MI while taking statins is 0.019.
MI
no MI
Total
Statins
95
2781
2876
No Statins
89
2028
2117
Explanation / Answer
Options (d) & (g) are correct.
EXPLANATION:
Table 1 can be written as follows:
MI No MI Total
Statins 95 2781 2876
No Statins 89 2028 2117
Total 184 4809 4993
We can write the above table as relative frequencies as follows:
MI No MI Total
Statins 0.0190 0.5570 0.5760
No Statins 0.0178 0.4062 0.4240
Total 0.0368 0.9632 1.0
From the above table, the following are seen:
(a) The relative risk of MI while taking statins is 0.0190. But, this is given as 0.044. So, (a) is wrong.
(b) The relative risk for non-statin users as compared with statin users = 0.4240/0.5760 = 0.7361. But, this is given as 0.773. So, (b) is wrong.
(c) The risk ratio of MI for statin users as compared with non-statin users = 0.0190/0.0178 = 1.0674. But, this is given as 0.773. So, (c) is wrong.
(d) The population attributable risk for MI due to statin = 0.0190. This is less than 2%. So, (d) is correct.
(e) The reduction in risk of MI attributable to stains = 0.0190. This is not more than 25%. So, (e) is wrong.
(f) The risk of MI while taking statins = 0.0190. This is not 33 per 1000. So, (f) is wrong.
(g) The risk of MI while taking statins is 0.019. So, (g) is correct.
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