Table 2

Content validity index values for the individual key domains identified by patients with fibromyalgia

Frequency

Mean importance

Frequency × importance product

Patient-identified domains

1. Pain

100

3.8

380.0

2. Fatigue

98

3.8

372.4

3. Sleep quality

91

3.7

336.7

4. Physical function

84

3.5

294.0

8. Morning stiffness

79

3.5

276.5

5. Anxiety

76

3.3

250.8

6. Depression

72

3.4

244.8

8. Memory problems

64

3.6

230.4

9. Quality of life

62

3.5

217.0

10. Occupational dysfunction

59

3.4

200.6

11. Social dysfunction

57

3.2

182.4

12 Problems with attention or concentration

53

3.1

164.3

Salaffi et al. Arthritis Research & Therapy 2009 11:R125   doi:10.1186/ar2792