Table 4

Convergent construct validity analysis: correlation matrix of overall FAS scores and their components vs the SF-36 dimensions

Medical outcomes SF-36 health survey

PF

RF

BP

GH

VT

SF

RE

MH

PCS

MCS

Spearman's rho

SAPS

Correlation coefficient

-0.142 (*)

-0.141 (*)

-0.214 (**)

-0.187 (**)

-0.175 (*)

-0.213 (**)

-0.242 (**)

-0.269 (**)

-0.139 (*)

-0.297 (**)

FATIGUE

Correlation coefficient

-0.143 (*)

-0.297 (**)

-0.451 (**)

-0.189 (**)

-0.670 (**)

-0.270 (**)

-0.327 (**)

-0.306 (**)

-0.342 (**)

-0.401 (**)

SLEEP

Correlation coefficient

0.148 (*)

0.139 (*)

-0.246 (**)

-0.213 (**)

-0.518 (**)

0.141 (*)

-0.276 (**)

-0.288 (**)

0.154 (*)

-0.401 (**)

FAS

Correlation coefficient

-0.138 (*)

-0.157 (*)

-0.336 (**)

-0.267 (*)

-0.593 (**)

-0.225 (**)

-0.318 (**)

-0.350 (**)

-0.240 (**)

-0.531 (**)

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

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

BP = bodily pain; FAS = Fibromyalgia Assessment Status; GH = perceived general health; MCS = mental component scale summary score; MH = mental health; PCS = physical component scale summary score; PF = physical functioning; RE = role function/emotional aspect; RF = role function/physical aspect; SAPS = Self-Assessment Pain Scale; SF = social functioning; SF-36 = Short Form 36 Health Survey; VT = vitality.

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