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Table 4 Pain level: year 2000 versus 2010

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