Fibromyalgia Impact Questionnaire (FIQ) total score severity categorization using pain severity as an anchor (pooled data).
| Pain Severity (anchor) | FM Impairment Category | FIQ Total Score |
|---|---|---|
| < 3.5 | Mild impairment | < 39 |
| 3.5–6.5 | Moderate impairment | ≥ 39 to < 59 |
| ≥ 6.5 | Severe impairment | ≥ 59 |