Question: Variable name Variable description id patient ID code age Age sex sex; female (1) vs. male (0) migraine diagnosis ; migraine (1) vs. tension-type (0)

Variable name Variable description
id patient ID code
age Age
sex sex; female (1) vs. male (0)
migraine diagnosis ; migraine (1) vs. tension-type (0)
chronicity number of years of headache disorder
acupuncturist acupuncturist id code
practice_id gp practice id
group treatment group; acupuncture (1) vs. control (0)
pk1 headache severity score baseline
pk2 headache severity score 3 month
pk5 headache severity score 1 year
f1 headache frequency baseline
f2 headache frequency 3 month
f5 headache frequency 1 year

Analyses of study data focused on headache severity scores (pk1, pk2, pk5), each coded using the following likert scale. The primary outcome was headache score at the one-year follow up.

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