R6 Ballot (3rd Draft) FHIR CI-Build

This page is part of the FHIR Specification v6.0.0-ballot3: Release 6 Ballot (3rd Draft) (see Ballot Notes ). The current version is 5.0.0 . For a full list Continuous Integration Build of available versions, see FHIR (will be incorrect/inconsistent at times).
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4.3.2.170 4.3.2.155 CodeSystem http://hl7.org/fhir/observation-statistics

Responsible Owner: Orders and Observations icon Work Group   Maturity Level : 0 Informative Use Context : Country: World
Official URL : http://hl7.org/fhir/observation-statistics Version : 6.0.0-ballot3
active as of 2022-12-01 2022-11-30 Computable Name : StatisticsCode
Flags : CaseSensitive, Complete. All codes ValueSet: Statistics Code OID : 2.16.840.1.113883.4.642.1.1126

"This This Code system is used in the following FHIR core-defined or referenced value sets:

4.3.2.170.1 4.3.2.155.1 Definition

The statistical operation parameter -"statistic" codes.

4.3.2.170.2 4.3.2.155.2 Content

Generated Narrative: CodeSystem observation-statistics

Last updated: 2025-04-01T12:16:37.966+11:00 Profile: Shareable CodeSystem 2025-11-24T20:46:00.1Z

This case-sensitive code system http://hl7.org/fhir/observation-statistics defines the following codes:

Code Display Definition Copy
average Average

The mean icon of N measurements over the stated period.

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maximum Maximum

The maximum icon value of N measurements over the stated period.

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minimum Minimum

The minimum icon value of N measurements over the stated period.

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count Count

The [number] of valid measurements over the stated period that contributed to the other statistical outputs.

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total-count Total Count

The total [number] of valid measurements over the stated period, including observations that were ignored because they did not contain valid result values.

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median Median

The median icon of N measurements over the stated period.

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std-dev Standard Deviation

The standard deviation icon of N measurements over the stated period.

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sum Sum

The sum icon of N measurements over the stated period.

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variance Variance

The variance icon of N measurements over the stated period.

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20-percent 20th Percentile

The 20th Percentile icon of N measurements over the stated period.

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80-percent 80th Percentile

The 80th Percentile icon of N measurements over the stated period.

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4-lower Lower Quartile

The lower Quartile icon Boundary of N measurements over the stated period.

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4-upper Upper Quartile

The upper Quartile icon Boundary of N measurements over the stated period.

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4-dev Quartile Deviation

The difference between the upper and lower Quartiles icon is called the Interquartile range. (IQR = Q3-Q1) Quartile deviation or Semi-interquartile range is one-half the difference between the first and the third quartiles.

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5-1 1st Quintile

The lowest of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population.

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5-2 2nd Quintile

The second of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population.

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5-3 3rd Quintile

The third of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population.

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5-4 4th Quintile

The fourth of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population.

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skew Skew

Skewness is a measure of the asymmetry of the probability distribution of a real-valued random variable about its mean. The skewness value can be positive or negative, or even undefined. Source: Wikipedia icon .

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kurtosis Kurtosis

Kurtosis is a measure of the "tailedness" of the probability distribution of a real-valued random variable. Source: Wikipedia icon .

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regression Regression

Linear regression is an approach for modeling two-dimensional sample points with one independent variable and one dependent variable (conventionally, the x and y coordinates in a Cartesian coordinate system) and finds a linear function (a non-vertical straight line) that, as accurately as possible, predicts the dependent variable values as a function of the independent variables. Source: Wikipedia icon This Statistic code will return both a gradient and an intercept value.

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See the full registry of code systems defined as part of FHIR.

Explanation of the columns that may appear on this page:

Level A few code lists that FHIR defines are hierarchical - each code is assigned a level. See Code System for further information.
Source The source of the definition of the code (when the value set draws in codes defined elsewhere)
Code The code (used as the code in the resource instance). If the code is in italics, this indicates that the code is not selectable ('Abstract')
Display The display (used in the display element of a Coding ). If there is no display, implementers should not simply display the code, but map the concept into their application
Definition An explanation of the meaning of the concept
Comments Additional notes about how to use the code