The evolution of the Karasek questionnaire score, obtained for each dimension, will be tested with a paired two-sample emergency physician's test (or nonparametric Wilcoxon test if necessary). Linear regression models or aleatory effects models (as described by Klar and Darlington, 2004, in Statistics in Medicine) will eventualy complete these analyzes. This will permit, with multivariate analyzes and the introduction of covariates, to seek for possible explanatory factors of the Karasek score and its evolution. The same process will be used for quantitative parameters that will be collected.