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Table 2 Characteristics of control subjects and patients with fibromyalgia

From: Alteration of serotonin transporter density and activity in fibromyalgia

Characteristic Healthy controls Patients with FM Reference range
Age (years) 50 ± 12 53 ± 13 -
Sex F F -
Tender points 2 ± 0.5 14.3 ± 3.72 0–18
TPi 1 ± 0.5 2.2 ± 0.5 0–3
FIQ 22.3 ± 16.33 57.1 ± 21.3 0–100
Tiredness 2.73 ± 2.7 7.4 ± 2.2 0–10
  1. Results are means ± SD. FIQ, Fibromyalgia Impact Questionnaire; FM, fibromyalgia; TPi, tender point index.