The subjects in MEFV mutation carriers group experienced more often: recurrent febrile episodes of unknown cause (p = 0.048, Phi = 0.213), diffuse abdominal pain (p = 0.023, Phi = 0.256), peritonitis (p = 0.01, Phi = 0.326), and malaise/fatigue (p = 0.006, Phi = 0.336), compared to control group (n = 76). This evidence concerns the gene MEFV and peritonitis.