Release 4B Snapshot 3: Connectathon 32 Base

This page is part of the FHIR Specification (v4.3.0: R4B - STU (v5.0.0-snapshot3: R5 Snapshot #3, to support Connectathon 32 ). The current version which supercedes this version is 5.0.0 . For a full list of available versions, see the Directory of published versions . Page versions: R5 R4B R4 R3

Using Codes Code Systems Value Sets Concept Maps Identifier Systems

4.3.14.197 4.3.2.175 Code System CodeSystem http://hl7.org/fhir/observation-statistics

Orders and Observations icon Work Group   Maturity Level : 0 Informative Use Context : Any Country: World, Country: World
This is a code system defined by the FHIR project. Committee:
Official URL : http://hl7.org/fhir/observation-statistics Version : 5.0.0-snapshot3
active as of 2022-12-01 Orders and Observations Computable Name : StatisticsCode Work Group
OID: 2.16.840.1.113883.4.642.1.406 (for OID based terminology systems) Flags : CaseSensitive, Complete. All codes ValueSet: StatisticsCode Source Resource XML / JSON OID : 2.16.840.1.113883.4.642.1.1126

This Code system is used in the following value sets:

4.3.2.175.1 Definition

The statistical operation parameter -"statistic" codes.

4.3.14.197.1 4.3.2.175.2 Content

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

Code Display Definition Copy
average Average The [mean](https://en.wikipedia.org/wiki/Arithmetic_mean) of N measurements over the stated period. btn   btn
maximum Maximum The [maximum](https://en.wikipedia.org/wiki/Maximal_element) value of N measurements over the stated period. btn   btn
minimum Minimum The [minimum](https://en.wikipedia.org/wiki/Minimal_element) value of N measurements over the stated period. btn   btn
count Count The [number] of valid measurements over the stated period that contributed to the other statistical outputs. btn   btn
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. btn   btn
median Median The [median](https://en.wikipedia.org/wiki/Median) of N measurements over the stated period. btn   btn
std-dev Standard Deviation The [standard deviation](https://en.wikipedia.org/wiki/Standard_deviation) of N measurements over the stated period. btn   btn
sum Sum The [sum](https://en.wikipedia.org/wiki/Summation) of N measurements over the stated period. btn   btn
variance Variance The [variance](https://en.wikipedia.org/wiki/Variance) of N measurements over the stated period. btn   btn
20-percent 20th Percentile The 20th [Percentile](https://en.wikipedia.org/wiki/Percentile) of N measurements over the stated period. btn   btn
80-percent 80th Percentile The 80th [Percentile](https://en.wikipedia.org/wiki/Percentile) of N measurements over the stated period. btn   btn
4-lower Lower Quartile The lower [Quartile](https://en.wikipedia.org/wiki/Quartile) Boundary of N measurements over the stated period. btn   btn
4-upper Upper Quartile The upper [Quartile](https://en.wikipedia.org/wiki/Quartile) Boundary of N measurements over the stated period. btn   btn
4-dev Quartile Deviation The difference between the upper and lower [Quartiles](https://en.wikipedia.org/wiki/Quartile) 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. btn   btn
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. btn   btn
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. btn   btn
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. btn   btn
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. btn   btn
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](https://en.wikipedia.org/wiki/Skewness). btn   btn
kurtosis Kurtosis Kurtosis is a measure of the "tailedness" of the probability distribution of a real-valued random variable. Source: [Wikipedia](https://en.wikipedia.org/wiki/Kurtosis). btn   btn
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](https://en.wikipedia.org/wiki/Simple_linear_regression) This Statistic code will return both a gradient and an intercept value. btn   btn

 

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