The invention relates to a method for monitoring excrement data for seeking a pattern for a monitoring period comprises acquiring excrement data comprising excrement data for at least two different time periods, each substantially corresponding to the monitoring period for which a pattern of events is sought. The excrement data is associated with at least one absorbent article and a person wearing said at least one absorbent article and comprises information of excrement supply into an absorbent article in form of excrement events. Each excrement event has an associated time mark or associated time information from which an associated time mark may be derived. Further, the method comprises providing a series of sequential non-overlapping time intervals, together substantially extending over the monitoring period and associating each time interval with a segment of a diagram. The method comprises also calculating a number of excrement events corresponding to each time interval for all time periods for which data is acquired and associating the number of excrement events corresponding to each time interval with a corresponding segment of the diagram. The invention relates also to a processing unit for performing the method. The invention relates also to a system for monitoring excrement data. The system comprises a sensor associated with an absorbent article, which is arranged to generate an output signal representative of the excrement state of said absorbent article over at least two different time periods, and a processing unit adapted to perform the method according to the first aspect of the invention.L'invention concerne un procédé de surveillance de données d'excréments visant à rechercher une régularité pendant une période de surveillance et qui consiste à faire l'acquisition de données d'excréments pendant au moins deux périodes différentes, chacune correspondant sensiblement à la période de surveillance pendant laquelle une régularité des événements est rech
