25th May 2025

Researchers are attempting to establish if unequal BP in both arms is a symptom of renal artery stenosis.

Researchers are attempting to establish if unequal BP in both arms is a symptom of renal artery stenosis. Patients <45 years old with hypertension were referred to the study and had their blood pressure in each arm taken to establish if there was a >20mmHg difference between both arms. An MRI renal angiography was used to confirm the diagnosis of renal artery stenosis. Eighty patients were enrolled in the study, with only 4 cases of renal artery stenosis confirmed. Of these patients, only 2 had an unequal BP of >20mmHg between both arms. 

Which statistical test is most appropriate to identify significant differences between the two groups?

Select the SINGLE most appropriate option from the list below. Select ONE option only.