A method reducing storage volume of a series of measured time-dependent parameters measured in or on the human body such as glucose values from a continuous glucose monitor while permitting retrospective reconstruction of measured data with sufficient accuracy. The series comprises a first number of measured values, and a second number of values that are stored. In this case, the second number is smaller than the first number. A first storage mode is provided, in which an interval of time between successive stored values is variable and which is adjusted on the basis of a time-based variability of the measured values. A second storage mode may also be provided, in which the interval, of time between successive stored values is constant. Embodiments of the invention include a measuring apparatus and a computer program.