Quality Measure Implementation Guide
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Quality Measure Implementation Guide, published by HL7 International / Clinical Quality Information. This guide is not an authorized publication; it is the continuous build for version 1.0.1-cibuild built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-cqm/ and changes regularly. See the Directory of published versions

Measure: Age Stratified Example (Experimental)

Official URL: http://hl7.org/fhir/uv/cqm/Measure/age-stratified-example Version: 1.0.1-cibuild
Standards status: Informative Computable Name: MeasureAgeStratifiedExample
Other Identifiers: OID:2.16.840.1.113883.4.642.40.61.29.20

A sample measure demonstrating age stratification using age ranges represented as ISO-8601-Derived periods.

Metadata
Title Measure Age Stratified Example
Version 1.0.1-cibuild
Identifier urn:oid:2.16.840.1.113883.4.642.40.61.29.20
Experimental true
Jurisdiction Global (Whole world)
Steward (Publisher) HL7 International / Clinical Quality Information
Description

A sample measure demonstrating age stratification using age ranges represented as ISO-8601-Derived periods.
Measure Basis boolean
Measure Scoring Cohort
Measure Group (Rate) (ID: primary)
Initial Population ID: primary-age-stratified-example-initial-population
Description: No description provided Criteria: Initial Population
Stratifier Code: Age Group
Description: Stratification by age groups represented as ISO-8601-Derived periods.
Measure Logic
Primary Library Age Stratification Example
Contents Population Criteria
Logic Definitions
Terminology
Dependencies
Data Requirements
Population Criteria
Measure Group (Rate) (ID: primary)
Initial Population 
define "Initial Population":
  exists (
    [Encounter] E
      where E.period during "Measurement Period"
  )
Definition
Stratifier 
/*
By Patient Age as of the start of the Measurement Period
Age (10-14, 15-19, 20+)
*/
define "By Age":
  case
    when AgeInYearsAt(start of "Measurement Period") in Interval[10, 14] then "P10Y--P15Y"
    when AgeInYearsAt(start of "Measurement Period") in Interval[15, 19] then "P15Y--P20Y"
    when AgeInYearsAt(start of "Measurement Period") >= 20 then "P20Y--P9999Y"
    else null
  end
Definition
Logic Definitions
Logic Definition Library Name: AgeStratificationExample 
define "Initial Population":
  exists (
    [Encounter] E
      where E.period during "Measurement Period"
  )
Logic Definition Library Name: AgeStratificationExample 
/*
By Patient Age as of the start of the Measurement Period
Age (10-14, 15-19, 20+)
*/
define "By Age":
  case
    when AgeInYearsAt(start of "Measurement Period") in Interval[10, 14] then "P10Y--P15Y"
    when AgeInYearsAt(start of "Measurement Period") in Interval[15, 19] then "P15Y--P20Y"
    when AgeInYearsAt(start of "Measurement Period") >= 20 then "P20Y--P9999Y"
    else null
  end
Logic Definition Library Name: FHIRHelpers 
/*
@description: Converts the given [Period](https://hl7.org/fhir/datatypes.html#Period)
value to a CQL DateTime Interval
@comment: If the start value of the given period is unspecified, the starting
boundary of the resulting interval will be open (meaning the start of the interval
is unknown, as opposed to interpreted as the beginning of time).
*/
define function ToInterval(period FHIR.Period):
    if period is null then
        null
    else
        if period."start" is null then
            Interval(period."start".value, period."end".value]
        else
            Interval[period."start".value, period."end".value]
Terminology
Code System Description: Code system ISO-8601-Derived Periods
Resource: ISO-8601-Derived Periods Codes
Canonical URL: http://terminology.hl7.org/CodeSystem/iso-8601-derived-periods
Direct Reference Code Display: 10-14 years
Code: P10Y--P15Y
System: http://terminology.hl7.org/CodeSystem/iso-8601-derived-periods
Direct Reference Code Display: 15-19 years
Code: P15Y--P20Y
System: http://terminology.hl7.org/CodeSystem/iso-8601-derived-periods
Direct Reference Code Display: 20+ years
Code: P20Y--P9999Y
System: http://terminology.hl7.org/CodeSystem/iso-8601-derived-periods
Dependencies
Dependency Description: Library FHIRHelpers
Resource: http://hl7.org/fhir/uv/cql/Library/FHIRHelpers|4.0.1
Canonical URL: http://hl7.org/fhir/uv/cql/Library/FHIRHelpers|4.0.1
Data Requirements
Data Requirement Type: Encounter
Profile(s): Encounter
Must Support Elements: period
Data Requirement Type: Patient
Profile(s): Patient
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