The chartevents table
Table source: MetaVision ICU database.
Table purpose: Contains all charted data for all patients.
Number of rows: 313,645,063
- patients on
- admissions on
- icustays on
- d_items on
chartevents contains all the charted data available for a patient. During their ICU stay, the primary repository of a patient’s information is their electronic chart. The electronic chart displays patients' routine vital signs and any additional information relevant to their care: ventilator settings, laboratory values, code status, mental status, and so on. As a result, the bulk of information about a patient’s stay is contained in chartevents. Furthermore, even though laboratory values are captured elsewhere (labevents), they are frequently repeated within chartevents. This occurs because it is desirable to display the laboratory values on the patient’s electronic chart, and so the values are copied from the database storing laboratory values to the database storing the chartevents.
- Some items are duplicated between the labevents and chartevents tables. In cases where there is disagreement between measurements, labevents should be taken as the ground truth.
|Name||Postgres Data type|
Identifiers which specify the patient:
subject_id is unique to a patient,
hadm_id is unique to a patient hospital stay and
stay_id is unique to a patient ward stay. More information about these identifiers is available here.
caregiver_id uniquely identifies a single caregiver who documented data in the ICU information system.
charttime records the time at which an observation was made, and is usually the closest proxy to the time the data was actually measured.
storetime records the time at which an observation was manually input or manually validated by a member of the clinical staff.
Identifier for a single measurement type in the database. Each row associated with one
itemid (e.g. 220045) corresponds to an instantiation of the same measurement (e.g. heart rate).
value contains the value measured for the concept identified by the
itemid. If this value is numeric, then
valuenum contains the same data in a numeric format. If this data is not numeric,
valuenum is null. In some cases (e.g. scores like Glasgow Coma Scale, Richmond Sedation Agitation Scale and Code Status),
valuenum contains the score and
value contains the score and text describing the meaning of the score.
valueuom is the unit of measurement for the
value, if appropriate.
warning specifies if a warning for this observation was manually documented by the care provider.
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