Fig. 3

a VAS-scores of pain intensity (VAS 0–100 mm). b Pain index (pain frequency x pain intensity, range 0–400). c Functional disability (VAS 0–100 mm), in patients with pain at baseline (n = 60), at T0 and T1 at follow-up (n = 46) and at follow-up only (n = 13). In 3abc, baseline represents the total group of patients with reports of symptoms. Follow-up represents two groups: 1) Patients with pain (Fig. 3ab) or functional disability (3c) at both T0 and T1), 2) patients with reports of pain (Fig. 3ab) or functional disability (3c) at follow-up only