A method, processing unit, and system for monitoring excrement data for seeking a pattern for a monitoring period includes acquiring excrement data including 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 includes 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 includes providing a series of sequential non-overlapping time intervals, together substantially extending over the monitoring period, associating each time interval with a segment of a diagram, 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.
