An effective meal average (EMA) value is presented, followed by two or more of the individual values that make up the EMA, to provide improved feedback data for clinical decisions by patients who need to alter their dose of insulin. The EMA can comprise a measure of the variability of its constituent values, encompass values that occur at specified times such as 1 hour before and after a specified meal time, and be calculated over a limited number of days previous to the calculation (e.g., 3 days) and have a minimum number of values that must be obtained within the time and date ranges. An algorithm can exclude any given reading from the average (e.g., post-prandial or control solution readings). Patients can use 1 to 8 EMA on any given date range (e.g., preferably 4, that is, breakfast, lunch, supper and bedtime snack).
