Moving time window aggregates over patient histories

Moving window concepts are used in temporal query languages for aggregate f unctions over the dimension 'time'. In the medical domain, aggregation of p atient data over time windows builds a powerful mechanism within clinical d atabase queries to satisfy a class of typical medical question formulations . Contrary to other fields, like the business domain for example, there is the additional need to synchronize time windows with the individual course of diseases rather than with the calendar system only. In this paper, we pr esent several variants of shifting time windows over patient histories and suggest a set of essential options for a moving window clause. The proposed parameters for window creation as well as suitable default settings are di scussed in the context of retrieving data from medical records. (C) 2001 El sevier Science Ireland Ltd. All rights reserved.