A computer-implemented method for analyzing glucose monitoring data comprising: receiving first glucose monitoring data indicative of a glucose level at a measurement time, the first glucose monitoring signals detected in one or more glucose measurement time periods over a first monitoring time period of a continuous glucose monitoring, determining at least one first range event selected from the following group: a normal glucose level event, a hyperglycaemia event, or a hypoglycaemia event; determining how often the first range event is determined for the first monitoring time period; providing a first minimum total, measurement time period, the first minimum total measurement time period being shorter in time than the first monitoring time period; generating first display data representing, for the at least one first range event, the number of first range events in a graphical representation, if the one or more glucose measurement time periods sum up to at least a first minimum total measurement time period; and outputting the first display data through the display device. Further, a portable device and a non-transitory computer readable medium are provided.