Table 3

Convergent construct validity analysis: correlation matrix of overall Fibromyalgia Assessment Status scores and their components vs the Fibromyalgia Impact Questionnaire dimensions

Physical functioning

Number of days felt good

Number of working days missed

Job ability

Pain

Fatigue

Tiredness

Stiffness

Anxiety

Depression

Total FIQ

Spearman's rho

SAPS

Correlation coefficient

0.217(**)

0.195(**)

0.191(**)

0.145 (*)

0.271(**)

0.136(*)

0.147(*)

0.136(*)

0.260(**)

0.212(**)

0.193(**)

FATIGUE

Correlation coefficient

0.571(**)

0.482(**)

0.568(**)

0.568 (**)

0.663(**)

1.000(**)

0.568(**)

0.556(**)

0.411(**)

0.257(**)

0.804(**)

SLEEP

Correlation coefficient

0.424(**)

0.259(**)

0.397(**)

0.397 (**)

0.391(**)

0.568(**)

1.000(**)

0.379(**)

0.326(**)

0.256(**)

0.618(**)

FAS

Correlation coefficient

0.294(**)

0.251(**)

0.257(**)

0.534 (**)

0.303(**)

0.379(**)

0.309 (**)

0.147(*)

0.255(**)

0.217(**)

0.347(**)

** Correlation significant at 0.001 level (2-tailed).

* Correlation significant at 0.01 level (2-tailed).

FAS = Fibromyalgia Assessment Status; SAPS = Self-Assessment Pain Scale.

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