Table 1 Clinical characteristics of the study samples

Control subjects (N = 23)

Osteoarthritis Sample 1 (N = 31)

Osteoarthritis Sample 2 (N = 34)

Age, years mean

63.3 (7.5)

65.6 (8.8)

63.7 (7.7)

Sex, number F/M

13/10

27/4

26/8

Radiological severity

___

2.0 (0.7)

2.3 (0.5)

WOMAC index, total

3.7 (6.3)

33.0 (11.9)

40.7 (19.6)

PainDetect

2.9 (3.7)

10.5 (5.7)

11.2 (6.2)

Clinical pain intensity (BPI)^a

4.6 (6.0)

17.4 (5.4)

19.8 (6.7)

Tibial region pain^b

0.9 (1.3)

7.3 (1.6)

6.9 (2.2)

Number of knee tender points

0.3 (0.7)

3.9 (1.7)

6.7 (2.2)

Temporal summation

0.3 (0.7)

1.8 (1.5)

1.6 (2.6)

Spontaneous body pain (max. 100)

___

___

4 (14)

Control subjects (N = 35)

Fibromyalgia Sample 1 (N = 38)

Fibromyalgia Sample 2 (N = 63)

Age, years mean

43.9 (6.0)

46.4 (7.5)

49.3 (8.0)

Sex, number F/M

35/0

38/0

63/0

Illness duration, years

___

7.0 (4.6)

6.6 (6.1)

Fibromyalgia tender points, n°

___

16.0 (1.9)

17.1 (1.5)

FIQ, total score

___

66.8 (13.9)

66.6 (13.9)

FIQ, functional capacity

___

4.9 (1.9)

6.0 (2.1)

General Perception of Health-SF36

___

31.2 (18.3)

39.2 (15.2)

HADS ratings for depression

___

8.8 (4.9)

8.9 (3.9)

HADS ratings for anxiety

___

11.3 (4.0)

10.3 (4.9)

Spontaneous body pain (max. 100)

___

71.7 (15.4)

73.1 (16.7)