<status value="active"/><experimental value="false"/><date value="2021-01-05T10:01:24+11:00"/><publisher value="HL7 (FHIR Project)"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom><telecom><system value="email"/><value value="fhir@lists.hl7.org"/></telecom></contact><description value="Logical grouping of characteristics."/><jurisdiction><coding><system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/><code value="001"/><display value="World"/></coding></jurisdiction><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/characteristic-combination"/><content value="complete"/><concept><code value="all-of"/><display value="All of"/><definition value="Combine characteristics with AND."/></concept><concept><code value="any-of"/><display value="Any of"/><definition value="Combine characteristics with OR."/></concept><concept><code value="at-least"/><display value="At least"/><definition value="Meet at least the threshold number of characteristics for definition."/></concept><concept><code value="at-most"/><display value="At most"/><definition value="Meet at most the threshold number of characteristics for definition."/></concept><concept><code value="statistical"/><display value="Statistical"/><definition value="Combine characteristics statistically. Use method to specify the statistical method."/></concept><concept><code value="net-effect"/><display value="Net effect"/><definition value="Combine characteristics by addition of benefits and subtraction of harms."/></concept><concept><code value="dataset"/><display value="Dataset"/><definition value="Combine characteristics as a collection used as the dataset."/></concept></CodeSystem>

This code system http://hl7.org/fhir/characteristic-combination defines the following codes:

Code	Display	Definition
all-of	All of	Combine characteristics with AND.
any-of	Any of	Combine characteristics with OR.
at-least	At least	Meet at least the threshold number of characteristics for definition.
at-most	At most	Meet at most the threshold number of characteristics for definition.
statistical	Statistical	Combine characteristics statistically. Use method to specify the statistical method.
net-effect	Net effect	Combine characteristics by addition of benefits and subtraction of harms.
dataset	Dataset	Combine characteristics as a collection used as the dataset.