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

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, yes^a

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