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The unsatisfactory category was defined as presence of multiple vessels in the centre of the field, good category had one blood vessel in the centre of the field, excellent category had clean procedure field with no blood vessels.
Up to and including ten procedures (a principal procedure field plus nine secondary procedures) could have been recorded.
All patients who underwent any LEA between financial years 2004 2005 and 2008 2009 were identified through having the procedure code for LEA in any procedure field.
Cardiovascular interventions were identified using procedure codes for PCI (OPCS4 K50, K50, and K75) or CABG (OPCS4 K40–K46) in any procedure field.
We identified cesarean deliveries by an ICD-9 (international classification of diseases, 9th revision, clinical modification) procedure code of 74 in any procedure field.
Records were defined as relating to a delivery if "method of delivery" information was found in any procedure field and/or the maternity tail field.
Similar(48)
All the procedure fields included in the MBDS were searched to identify all percutaneous procedures performed.
The method of delivery was obtained primarily from the procedure fields.
The VAED records were selected based on diagnosis fields and some exclusions were made based on procedure fields (Table 1).
Interventions were defined using the Office of Population Censuses and Surveys' Classification of Surgical Operations (OPCS4) codes in up to 12 procedure fields.
Clinical data are stored as ICD-10-AM codes in 40 diagnosis and procedure fields in the VAED [ 41].
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