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Agreement analysis of timings to symptom onset following nitroglycerin exposure on two triggered visits.
| n = 25 | NTG headache visits 1 and 2 | Premonitory symptoms visits 1 and 2 | Migraine headache visits 1 and 2 |
|---|---|---|---|
| Intraclass correlation coefficient | 0.440 | 0.842 | 0.655 |
| Intraclass correlation p-value | 0.08 | <0.001* | 0.006* |
