: Data-Field 41260

Data-Field 41260

Description:	Date of first operative procedure - main OPCS4
Category:	Health outcomes ⏵ Externally sourced health outcomes ⏵ Hospital inpatient ⏵ Summary Operations
	Health outcomes

Participants

448,204

Date

Both sexes

Jan 2019

2,354,258

Data

Singular

Aug 2025

Ongoing

Primary

Yes (60)

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Data

2,354,258 items of data are available, covering 448,204 participants.
Array indices run from 0 to 59.

Maximum	2023-03-31
Decile 9	2021-03-23
Decile 8	2019-01-25
Decile 7	2017-02-23
Decile 6	2015-02-20
Median	2012-12-21
Decile 4	2010-09-07
Decile 3	2008-01-31
Decile 2	2004-11-18
Decile 1	2000-12-21
Minimum	1988-12-12

There are 12322 distinct values.
Mean = 2012-01-02

Notes

This field provides, for each participant, the dates when each of the main procedures in Field 41200 was first recorded in the participant's hospital inpatient records. The date can be linked to Field 41200 by using the array structure.

Please note that we have opted to populate this data-field with the episode start date (EPISTART in the HESIN table) or, if that was missing, the admission start date (ADMIDATE in the HESIN table) rather than use the operation date (OPDATE in the HESIN_OPER table). The rationale for this was:

around 1 in 5 primary procedures lacked a corresponding value for OPDATE in HESIN_OPER;

some recorded OPDATEs were inconsistent with the other date fields such as EPISTART, ADMIDATE, EPIEND and DISDATE (most likely due to data entry errors);

for those episodes with a value for OPDATE recorded the majority were the same as the value of EPISTART, with around 99% of OPDATE values within 7 days of the value of EPISTART;

values of EPISTART/ADMIDATE are more complete and thus may provide greater consistency across data providers.

See the Operations tab of the Hospital Inpatient Data Dictionary (Resource 141140) for further information about these fields.

1 Related Data-Field

Field ID	Description	Relationship
41200	Operative procedures - main OPCS4	Current Field is the date of the first occurrence of Field 41200

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