"mRS 3-6 at 90 days" is an outcome, defined by a CQL expression, used in expressing what an Evidence is about.

<type value="person"/><membership value="definitional"/><characteristic><code><coding><system value="http://snomed.info/sct"/><code value="260905004"/><display value="Condition"/></coding></code><valueExpression><description value="mRS 3-6"/><language value="text/cql"/><expression value="["Observation": code in "75859-9|LOINC"] mRS where mRS.value between 3 and 6"/></valueExpression><exclude value="false"/><description value="mRS 3-6 at 90 days"/><timing><contextCode><coding><system value="http://hl7.org/fhir/evidence-variable-event"/><code value="study-start"/><display value="Study Start"/></coding></contextCode><offsetDuration><value value="90"/><unit value="days"/><system value="http://unitsofmeasure.org"/><code value="d"/></offsetDuration></timing></characteristic></Group></contained><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"><valueCode value="cds"/></extension><name value="ModifiedRankinScaleScore36At90DaysAfterTreatment"/><title value="Modified Rankin Scale score 3-6 at 90 days after treatment"/><status value="draft"/><publisher value="HL7 International / Clinical Decision Support"/><contact><telecom><system value="url"/><value value="http://www.hl7.org/Special/committees/dss"/></telecom></contact><description value="Modified Rankin Scale score 3-6 at 90 days after treatment"/><actual value="true"/><definition><reference><reference value="#Definition-Group"/></reference></definition><handling/></EvidenceVariable>