The present invention relates to the field of schizophrenia diagnostics and disease management. Specifically, it relates to a method assessing schizophrenia in a subject comprising the steps of determining at least one usage behavior parameter from a dataset comprising usage data for a mobile device within a first predefined time window wherein said mobile device has been used by the subject and comparing the determined at least one usage behavior parameter to a reference, whereby schizophrenia will be assessed. The present invention also relates to a mobile device comprising a processor, at least one sensor recording usage data and a database as well as software which is tangibly embedded to said device and, when running on said device, carries out the aforementioned method. Also contemplated by the invention is a system comprising a mobile device comprising at least one sensor recording usage data and a remote device comprising a processor and a database as well as software which is tangibly embedded to said device and, when running on said device, carries out the aforementioned method, wherein said mobile device and said remote device are operatively linked to each other. Also, the invention relates to the use the mobile device or the system for assessing schizophrenia analyzing a dataset comprising usage data for a mobile device within a first predefined time window wherein said mobile device has been used by the subject.
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