Case Data

"The "cases" table is the base table of the SICdb dataset and the "CaseID" field serves as the identifier that relates all data. Each admission to the intensive care unit generates a unique "CaseID." To identify readmissions, a "PatientID" is provided. The "OffsetAfterFirstAdmission" field stores the time between the first admission and the current one.

"TimeOfStay" is the time in seconds from the admission recorded by the MetaVision system to the discharge. This time may include any preceding surgery and ends when the case is closed.

There are three fields indicating survival: "DischargeState" indicates the patient's state upon discharge from the ICU and is taken from the MetaVision discharge form. "HospitalDischargeType" provides information on how the case was closed in the clinical information system. "OffsetOfDeath" is the time in seconds from admission to death and includes additional hospital stays and out of hospital mortality. As it refers to a 1-year mortality it is set to null if death occurred more than one year after admission.

cases.csv.gz

Name	Type	Description	Comment
CaseID	Integer	A randomly assigned identifier	CaseID is unique to each admission.
PatientID	Integer	A randomly assigned identifier	PatientID is unique to each Patient, useful to identify readmission
AdmissionYear	Integer	Year of admission
TimeOfStay	Integer	Time of stay (seconds)	Time from primary metavision admission, to last discharge. In cases, where the patient is admitted to ward after surgery, this will include surgery time.
ICUOffset	Integer	Time of actual ICU admission	SICdb includes preceding surgery if applicable, this field indicates the first transfer to an intensive or intermediate care ward
saps3	Float	Simplified Acute Physiology Score III
HospitalDischargeType	Reference	Type of hospital discharge.	This field indicates survival.
HospitalDischargeDay	Integer	The day of hospital discharge after admission	Note that this data is only available in days
HospitalStayDays	Integer	Days stayed in hospital for this case, including pre icu.
DischargeState	Reference	Type of icu discharge	This field indicates survival on icu
DischargeUnit	Reference	Unit the patient was discharged to, as selected in Metavision discharge form
OffsetOfDeath	Integer	1-year mortality in seconds from primary admission to death	1 year mortality, including out-of-hospital as far as known. See The "OffsetOfDeath" field denotes the elapsed time, in seconds, from admission to death, taking into account any subsequent hospital stays and out-of-hospital mortality data. The data was gathered from various sources, including government data. It is set to null if the death occurs more than one year after admission, since it is defined to 1-year mortality. For technical reasons observation time is only 6 month for some patients, field "EstimatedSurvivalObservationTime" holds information about that. However, it is worth noting that in some cases, if a patient dies in foreign countries, the information may be scarce. Postal address validity checks were performed, but no statistically significant differences were found, indicating that this may not be an issue of concern. for further information.
EstimatedSurvivalObservationTime	Reference	Estimation of oversation time, either 1-year or 6-month
Sex	Reference
WeightOnAdmission	Float	Rounded to +-5kg
HeightOnAdmission	Float	Rounded to +-5cm
AgeOnAdmission	Integer	Rounded to +-5y, over 90 set to 90
HospitalUnit	Reference	Last unit using this case
ReferringUnit	Reference	Referring unit as selected in admission form	Note: Unfortunatly in some cases "Notaufnahme" is selected here, so the referring unit is not specified in these cases.
ICD10Main	Text	ICD10 main code
ICD10MainText	Text	ICD10 main text
SurgicalSite	Reference
InterventionsText	Text	List of interventions
HoursOfCRRT	Integer	Hours of continuous renal replacement threapy this admission **
AdmissionFormHasSepsis	Reference	A mandatory field in the admission form **
HeartSurgeryAdditionalData	For heart surgery patients there is additional data collected **	Yes if applicable
HeartSurgeryCPBTime	Integer	Bypass time **
HeartSurgeryBeginOffset	Integer	Offset in seconds from ICU admission to cut **
HeartSurgeryEndOffset	Integer	Offset in seconds from ICU admission to end of surgery**
OffsetAfterFirstAdmission	Integer	If a patient has more than one admission, this is the offset in seconds from the first

* These fields are not available on PhysioNet at the moment. Contact us for further information.
** These fields will be moved to data tables in version 1.1.0

Linked Data

Additional data to the case can be found in data_ref, which may have one entry per case and item type.

Several fields have been preprocessed and added to the database. This includes peprocessed-for-convenience and preprocessed-for-anonymization elements. The data is found in data_ref.csv.gz, the text values are referenced in d_references, where d_references.ReferenceGlobalID relates to data_ref. FieldID and data_ref.RefID.

Fields

Name	Type	Description
PremedicationBetablocker	Referenced	Yes/No
PremedicationACEInhibitor	Referenced	Yes/No
PremedicationStatin	Referenced	Yes/No
PremedicationDiuretic	Referenced	Yes/No
PreconditionDiabetes	Referenced	Any type of diabetes (IDDM or NIDDM)
PreconditionLungDisease	Referenced	Any kind of lung severe disease (COPD, restrictive lung diseases, ...). Asthma is included when medication is taken daily
PreconditionArtHypertension	Referenced	Any kind of treated or diagnosed arterial hypertension
PreconditionRenalDysfunction	Referenced	If stated in admission protocol (omitted due to anonymity issues)

As this is the base table, defined fields are mostly similar to raw fields and are not documented twice.

Known Limitations

The cases data is generally considered as being widely valid. Nevertheless there are some limitations to be stated.

Time of stay

In most cases at a readmission in same hospital stay a new case is created. In rare cases the preceding case is reopened causing that TimeOfStay includes the time patient was on normal ward. If this issue is important you may use the tranfer log or the lacking monitor signals to remove/repair these cases. This issue is on ToDo list for future releases