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Table 1 Background data for women with fibromyalgia (FM) and the healthy reference group

From: Acute effects of physical exercise on the serum insulin-like growth factor system in women with fibromyalgia

  Women with FM, n = 22 Reference group, n = 26 p-value
  Mean SD Range Mean SD Range  
Age, year 44 4 33–50 44 5 29–50 0.808
BMI, kg/m2 28.2 5.3 20.5–38.9 23.2 2.7 18.8–31.2 <0.001
Fat, kg 28.3 12.0 11–51 17.6 8.0 4–40 0.001
Fat free mass, kg 47.8 7.0 38–63 47.9 5.4 39–60 0.695
Tender points, 0–18 13 1.8 11–16 0 0 0 <0.001
Pain localisations, 0–18 13 3.4 6–18 1.0 1.4 0–5 <0.001
Algometry, kPa 255 56 167–403 378 107 173–566 <0.001
Smoking, yesa N = 2   0–2 N = 0   0 0.186
Sleep quantity, 1–4 2.8 0.9 1–4 2.1 0.6 1–3 0.003
Sleep quality, 1–4 2.6 0.7 1–4 1.6 0.6 1–3 <0.001
Work hours, 0–40 27 10.5 0–40 37 5.0 20–40 <0.001
FIQ total score, 0–100 48 16 10–73 9 9 0–28 <0.001
Hand force, maximum, right hand, N 215 83 67–381 252 60 130–396 0.129
LTPAI, hours/week 5.3 3.5 1–17 7.0 4.2 1–16 0.170
LTPAI, hard, hours/week 0.6 1.3 0–6 1.4 1.4 0–6 0.024
  1. FIQ Fibromyalgia Impact Questionnaire, LTPAI Leisure Time Physical Activity Instrument, Algometry = pain threshold
  2. aInformation from one subject with FM was missing