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Chapter 27, Question 1.
Blood pressure measurements

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A middle-aged man has his systolic blood pressure measured as 169 mm Hg when he attends his doctor's surgery. The doctor takes the patient's blood pressure a month later and finds that its value has dropped to 153 mm Hg. The patient has not changed his lifestyle during the month nor has he received any hypotensive treatment.
Select all of the following statements which you believe to be true. The doctor would have taken this second blood pressure measurement before recommending measures to lower the patient's blood pressure because:

It was a way of checking whether the sphygmomameter was faulty.
The doctor believed that the patient's blood pressure would drop because of the regression to the mean phenomenon.
A man's blood pressure is always lower when taken a second time.
It is impossible to establish whether there is a linear relationship between age and systolic blood pressure if there is only one observation on each man.
The doctor knew that the patient's father, at the same age, had a systolic blood pressure which was greater than 169 mm Hg.