inst/QueryLibrary/Aggregate/observation_period/OP06.md

In sib-swiss/dsQueryLibraryServer: OMOP query Library

OP06: Average length of observation, in days.

Description

Count average number of observation period days.

Query

SELECT 
  AVG(observation_period_end_date - observation_period_start_date) AS num_days
FROM @cdm.observation_period;

Input

None

Output

| Field | Description | | --- | --- | | num_days | Average length of observation period, in days |

Example output record

| Field | Value | | --- | --- | | num_days | 966 |

Documentation

https://github.com/OHDSI/CommonDataModel/wiki/

sib-swiss/dsQueryLibraryServer documentation built on Feb. 13, 2025, 8:07 p.m.