Table 1 Baseline patient characteristics

Pain (NRS), mean (SD)

6.1 (2.1)

1-10

120

Interference (MPI), mean (SD)

4.1 (1.1)

1.1-5.9

120

Depression (BDI-II), mean (SD)

20.8 (8.9)

4 –51

120

Psychological functioning (SCL 90), mean (SD)

179.3 (48.6)

108-409

116

Anxiety (HADS), mean (SD)

8.1 (3.6)

0-17

116

Emotional representation (IPQ), mean (SD)

19.2 (4.7)

8-30

120

Coherence (IPQ), mean (SD)

15.0 (4.8)

6-25

119

Consequence (IPQ), mean (SD)

20.9 (4.4)

10-30

120

Personal control (IPQ), mean (SD)

18.6 (4.3)

6-30

120

Treatment control (IPQ), mean (SD)

16.2 (2.9)

5-25

120

Timeline cyclical (IPQ ), mean (SD)

15.3 (3.2)

4-20

120

Timeline (IPQ), mean (SD)

23.6 (3.6)

12-30

120

General self efficacy (DGSS), mean (SD)

2.9 (.6)

1.2- 4.1

120

Fear avoidance (TSK), mean (SD)

36.5 (7.5)

21-56

120

Avoidance behavior (PCI), mean (SD)

2.5 (.6)

1-4

120

Catastrophizing (CSQ), mean (SD)

23.9 (11.0)

1.0-50.0

120

Impact of FM (FIQ), mean (SD)

51.8 (11.0)

25.8 – 77.8

120

Fatigue (FIQ), median (IQR)

8.0 (7.25; 10.0)

4-10

120

Activity level (MPI), mean (SD)

2.6 (.9)

0-5.1

120

Gender, Female (%)

95

114

Age

45.0 (10.3)

21-69

120

Partnership, Yes (%)

51

n= 61

Ethnicity (%)

Native

71

n= 85

Western non native

13

n= 15

Non western non native

17

n= 20

Education (%)

Primary

18

n= 21

Secondary

50

n= 59

High

33

n= 39