From: Refractory chronic migraine: long-term follow-up using a refractory rating scale
Initial degree of refractoriness | Initial pain level (2000) (1–10, 10 = worst) | Final pain level (2010) | Change (%) from 2000 to 2010 |
---|---|---|---|
Mild (2–4) N = 24 | 7.8 | 4.3 | −45% p < 0.001, effect size (ES) = 2.55 |
Moderate (5–7) N = 67 | 7.7 | 4.5 | −42% p < 0.001, ES = 1.30 |
Severe (8–10) N = 38 | 8.6 | 5.5 | −36% p < 0.001, ES = 2.16 |