• Antonio Collado, Xavier Torres, Osvaldo D Messina, Luis F Vidal, Patricia Clark, Carlos Ríos, Emília Solé, Anna Arias, Serge Perrot, and Patricia A Salomon.
• *Fibromyalgia Unit, Rheumatology Service, Institut Clínic de l'Aparell Locomotor, Hospital Clínic de Barcelona, Barcelona, Spain.
• Pain Med. 2016 May 1; 17 (5): 931-9.

ObjectiveTo assess the transcultural equivalency of the Spanish version of the Fibromyalgia Rapid Screening Tool (FiRST) and its discriminatory ability in different Latin American samples.DesignValidation study.SettingDepartments of Rheumatology in general hospitals and private centers; fibromyalgia unit in a university hospital.Subjects350 chronic pain patients from Spain, Argentina, Mexico, Peru, and Ecuador.MethodsThe cultural relevance of the Spanish version of the FiRST was evaluated. The ability of the FiRST as a screening tool for fibromyalgia was assessed by logistic regression analysis. To determine the degree to which potential confounders, such as differences in demographics, pain, affective distress, catastrophizing, and disability, might affect the discriminatory ability, the tool was reassessed by hierarchical multivariate logistic regression.ResultsSlightly different versions of the FiRST were recommended for use in each Latin American subsample. The FiRST showed acceptable criterion validity and was able to discriminate between fibromyalgia and non-fibromyalgia patients even after controlling for the effect of potential confounders. However, low specificities were observed in samples from Spain and Mexico.ConclusionsThe Spanish version of the FiRST may be used as a screening tool for fibromyalgia in several Latin American subsamples, even in those patients with high scores on potential confounders. In Spain and Mexico, the low specificity of the FiRST suggests, however, that it would be best used to support a suspected diagnosis of fibromyalgia, rather than to exclude the diagnosis.© 2015 American Academy of Pain Medicine. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

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