1. A query system, configured to access or obtain patient data from a medical information system comprising a set of electronic patient monitoring devices, wherein said query system comprises: A. a query script generator configured to apply an executable scripting language to a set of query attributes associated with elements of a subset of data of multiple patients, the query script generator defining and storing one or more query scripts as representations of at least some of the query attributes in the applied executable scripting language, wherein the one or more query scripts include a selectable statistical filter that narrows the subset of data of multiple patients based on an application of a statistical function on a group of values selected from a second subset of data of multiple patients; B. a query script executor, configured to apply said one or more query scripts to said data of multiple patients and to generate query results comprising said elements of said subset of data of multiple patients; C. an output generator, configured to output said query results; and D. a filter manager, configured to facilitate customization of the selectable statistical filter, the filter having a selectable value, and to apply said selectable filter and selectable value to said set of query attributes, wherein said selectable statistical filter is configured to narrow the subset of data of multiple patients.