Table 1.

Illustrations of alternative types of data preprocessing filters applied to different types of clinical measurements

Item	Date group/type	Data type/nature	Derived-data aggregation method
1	Biographical	Static/single	As is
2	Daily vital data	Time series (daily)	Min, max, mean
3	Braden (4 metrics)	Time series	min, max for each
4	Location/units	Unit names and dates	LOS for each location
5	Periop	Time series	avg, absolute min, absolute max
6	Surgical related data
	Anesthesia duration	Time series (minutely)	Total duration
	Procedure room stay	Time series (minutely)	Total duration
	Surgical schedule?	Categorical	As is?
	Surgical service?	Categorical	As is?
7	Staffing data	Time series	Mean (RN HPPD and Total HPPD)
8	ASA data (severity of illness)	Time series	Min, max, mean, SD

*American Society of Anesthesiologists (ASA)