Table 2 .

Fields Used for the Extensional Definitions of Each Numeric Concept Identifier (NCID)

Field	Description
NCID	Numeric concept identifier used for evaluating match results.
Name	The local laboratory name for the observation.
Frequency	Percentile for the frequency of this NCID in the data set.
Mean	The mean of the numeric result values, if numeric.
Standard Deviation	The standard deviation of the numeric result values, if numeric.
Codes	An array of the 10 most frequent coded values.
Co-occurrences	An array of the 14 most frequent co- occurring NCIDs.
Units	Unit of measure for the result value as a coded entry.
Mean Group	Group labels created to allow blocking for the mean.
SD Group	Group labels created to allow blocking for the standard deviation.
Frequency Group	Group labels created to allow blocking for the frequency.