From: Stress levels predict substantial improvement in pain intensity after 10 to 12 years in women with fibromyalgia and chronic widespread pain: a cohort study
Baseline n (%)
Follow-up n (%)
Mild impairment (< 39 p)
11 (9)
43 (34)
Moderate impairment (≥39 to < 59 p)
35 (28)
40 (32
Severe impairment (≥59 p)
79 (63)
42 (33)