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Index date: day before first contact to GP.
dAt index date.
bTime from first recorded migraine diagnosis to index date.
Patients' first date of therapy was considered their index date.
For controls, index date was the day of the interview.
cDiagnosed before the index date.
aAge at diagnosis index date.
‡In year before index date.
* Age measured at index date.
Each participant was assigned an index date.
Results were calculated for each index date.
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