Validation of the new paediatric criteria for the diagnosis of familial Mediterranean fever: data from a mixed population of 100 children from the French reference centre for auto-inflammatory disorders

Methods. The study group included 100 FMF children from the French reference centre for auto-inflammatory disorders. A control group of 40 patients with unexplained recurrent fever was reviewed in parallel. Both groups of patients were assessed for both the Tel Hashomer and the new paediatric criteria published by Yalcinkaya et al. Results. Comparison of Tel Hashomer vs Yalcinkaya's criteria in both groups gave a sensitivity of 99 vs 100%, a specificity of 45 vs 50%, a positive predictive value (PPV) of 81.8 vs 83.3% and a negative predictive value (NPV) of 94.7 vs 100%. However, when we used at least three Yalcinkaya's criteria we obtained a sensitivity of 77% and a specificity of 95% with a PPV of 97.3% and an NPV of 62.3%. The number of mutations in the MEFV gene did not modify results for both sets of criteria. Conclusion. The new paediatric Turkish criteria did not make a better contribution to FMF diagnosis than the Tel Hashomer criteria in our mixed population of French children while using an appropriate control group. However, if needed, they can be applied using at least three criteria, which slightly decreases their sensitivity but markedly increases their specificity.