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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.

# concept[].definition
Meet at least the threshold number of characteristics for definition.

# concept[].definition
Meet at most the threshold number of characteristics for definition.

# concept[].definition
Combine characteristics statistically. Use method to specify the statistical method.

# concept[].definition
Combine characteristics by addition of benefits and subtraction of harms.

# concept[].definition
Combine characteristics as a collection used as the dataset.