Fig. 2.

Results of multivariate logistic regression analysis. Odds Ratios and 95% confidence interval of variables significantly associated with MAS development; x-axis was represented with logarithmic scale to facilitate graphical description. As noted, patients with a normal platelet count or even more with thrombocytosis have a lower probability to develop MAS; similarly, this probability decreases along with the increase of the age at the time of disease onset, provided as decades of life at the time of disease onset. On the contrary, patients with monoarthritis and hepatomegaly are more prone to develop MAS. The figure represents the outcome of a stepwise multivariate logistic regression analysis. Forty non-MAS patients characterized by an inadequate retrospective data collection (less than 80% of data required) were not considered for regression analysis