Table 1 Frequency of fibromyalgia (FM) comorbidity in the primary headache groups
From: Clinical features of headache patients with fibromyalgia comorbidity
| Â | No FM (no.) | FM (no.) |
|---|---|---|
Main ICHD II group | ||
 Cod 1.00 migraine | 521 | 113 |
 Cod 2.00 tension-type headache | 100 | 54 |
 Cod. 3.00 cluster headache and other TACs | 24 |  |
 Cod.4.00 other primary headaches | 35 | 2 |
Total | 680 (80.1%) | 169 (19.9%) |