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In this work, we aim to determine the main factors driving behavioral change during the seasonal flu. To this end, we analyze a unique dataset comprised of 599 surveys completed by 434 Italian users of Influweb, a Web platform for participatory surveillance, during the 2017-18 and 2018-19 seasons. The data provide socio-demographic information, level of concerns about the flu, past experience with illnesses, and the type of behavioral changes implemented by each participant. We describe each response with a set of features and divide them in three target categories. These describe those that report i) no (26 %), ii) only moderately (36 %), iii) significant (38 %) changes in behaviors. In these settings, we adopt machine learning algorithms to investigate the extent to which target variables can be predicted by looking only at the set of features. Notably, $66%$ of the samples in the category describing more significant changes in behaviors are correctly classified through Gradient Boosted Trees. Furthermore, we investigate the importance of each feature in the classification task and uncover complex relationships between individuals characteristics and their attitude towards behavioral change. We find that intensity, recency of past illnesses, perceived susceptibility to and perceived severity of an infection are the most significant features in the classification task. Interestingly, the last two match the theoretical constructs suggested by the Health-Belief Model. Overall, the research contributes to the small set of empirical studies devoted to the data-driven characterization of behavioral changes induced by infectious diseases.
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