Does the cognitive index of the symptom severity scale evaluate cognition? Data from subjective and objective cognitive measures in fibromyalgia.

Objectives: The current provisional diagnostic criteria for the fibromyalgia syndrome (FM) include a cognitive index score (SSS-Cog), which constitutes a part of the Symptom Severity Scale (SSS). The current study aimed at assessing the validity of the cognitive index score, by comparing this subjective measure of cognitive impairment with an objective measure of cognitive functioning, collected through comprehensive computerised cognitive testing and assessment.

Methods: 50 FM patients underwent a computerised cognitive assessment battery, including testing in domains of memory, executive function, attention and information processing speed (NeuroTraxCorp.