A migraine is a particularly painful type of headache, which patients sometimes

Question

A migraine is a particularly painful type of headache, which patients sometimes wish to treat with acupuncture. To determine whether acupuncture relieves migraine pain, researchers conducted a randomized controlled study where 89 females diagnosed with migraine headaches were randomly assigned to one of two groups: treatment or control. 43 patients in the treatment group received acupuncture that is specifically designed to treat migraines. 46 patients in the control group received placebo acupuncture (needle insertion at non-acupoint locations). 24 hours after patients received acupuncture, they were asked if they were pain free. Results are summarized in the contingency table below (Allais, 2011).
(round answers to 2 decimal places)

a) What percent of patients in the treatment group were pain free 24 hours after receiving acupuncture?  %
b) What percent of patients in the control group were pain free after 24 hours?  %

Pain Free: Yes Pain Free: No Total Treatment 10 33 43 Control 2 44 46 Total 12 77 89

Explanation / Answer

Number of patients in the Treatment group = 43

Number of patients were pain free 24 hours after receiving acupuncture in the treatment Group = 10

Percent of patients in the treatment group were pain free 24 hours after receiving acupuncture

=(Number of patients were pain free 24 hours after receiving acupuncture in the treatment Group /  Number of patients in the Treatment group ) * 100 = (10/43) * 100= 23.26%

Percent of patients in the treatment group were pain free 24 hours after receiving acupuncture = 23.26%

Number of patients in the Control group = 46

Number of patients were pain free after 24 hours control Group = 2

Percent of patients in the Control group were pain free 24 hours

=(Number of patients were pain free after 24 hours in the Control Group /  Number of patients in the Control group ) * 100 = (2/46) * 100= 4.35%

Percent of patients in the Control group were pain free 24 hours = 4.35%

Pain free : Yes Pain Free : No Total Treatment 10 33 43 Control 2 44 46 Total 12 77 89

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