Screening Services - Breast Screening Data. The aim of the breast screening programme is to reduce mortality from breast cancer. Women aged 50 to 70 who are resident in Wales, and registered with a General Practitioner, are invited for a mammogram.

MDW Discover  > Breast Test Wales (SBTW) @ 370

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https://phw.nhs.wales/services-and-teams/screening/breast-screening/programme-reports/annual-statistical-reports/

https://phw.nhs.wales/services-and-teams/screening/

Administrative and clinical information for breast screening; routine screening is currently offered to women who are resident in Wales aged 50 to 70 years. Older women can self-refer.

This dataset contains all individuals who are eligible for breast screening: routine invitations, self-referrals and family history screening women.

Approx 70-80% coverage of Welsh population through GP registrations.

HDR UK

["Public Health Wales NHS Trust"]

Encrypted Anonymised Linking Field (ALF). This field is derived from by double encryption after splitting demographic information and clinical information; the first encryption occurs in NHS Wales Informatics Service (NWIS), and the second in SAIL. If the NHS number is not supplied in the data extract, then matching methods are applied; please refer to ALF_MTCH_PCT.

ALF_E

Encrypted Unique Breast Test Wales ID reference number, joined with Encrypted Anonymised Linking Field (ALF), to give demographic information for Breast Screening individuals and tests/results by anonymised individual, as well as geographic data down to the LSOA level.

BTW_ALF

Anonymised Linked Field Match Percentage. This number is a match % score from probabalistic matching, when joining together anonymised data. This linkage process consists of matching against the Welsh Demographic Service by NHS number, where a valid number exists, and where there is no valid number then matching is attempted using first name, surname, date of birth, and postcode. This is an artificial score with no real-world meaning; i.e. a match of .99 does not mean there is a 99% chance the match is correct. This number is assigned when deriving the Encrypted Anonymised Linking Field.

ALF_MTCH_PCT

Anonymised Linked Field Status Code. This is assigned when deriving the Encrypted Anonymised Linking Field.

ALF_STS_CD

Date when the data made available i.e. date of loading into database.

AVAIL_FROM_DT

EXTRACT_DT

FIELD_1

FIELD_2

FIELD_3

FIELD_4

This is the sex (gender) of person, employee or patient. Can potentially assist in correct identification of gender-specific primary cancer sites. Can potentially be different from gender identity as stated/assigned at birth.

GNDR_CD

LSOA2011_CD

PROCESSED_DATE

Encrypted Unique Breast Test Wales ID reference number for data linkage.

SYSTEM_ID_E

Week of birth for the person/individual in question. The date of birth is tranlated to the date of the Monday that occurs prior to the actual date of birth - this is/was chosen by HIRU [Health Information Research Unit]. All age calculations will be accurate to +/- 7 days. Possible that this calculation could result in strange findings, such as finding individuals that have been prescribed medication prior to being born, or etc.

ASS_DATE

BTW_ASSESSMENTS

CAN_FLG

FN_ASP_DIAG_FLG

SURG_BIOPSY_FLG

WBN_DIAG_FLG

Contains details of all invitations for a breast screening test and the type of invitation.

BTW_INVITATIONS

INVITE_DT

Code for invite type - for full description see INVITE_TYPE_DESC, which explanes the type invitation sent by Breast Test Wales to an individual. Invitations types can either be routine [normally scheduled] or self-referrals. Routine invites are those automatically sent to eligible individuals every two years, with response rates varying by region/LSOA. Specific invitation types can be one of the following: A = routine invite, no previous invites or screens; B = routine invite, previous invite but no previous screen; C1 = routine invite, previous screen within last 5 years; C2 = routine invite, previous screen more than 5 years ago; F1 = self-referral invite, previous screen within last 5 years; F2 = self-referral invite, previous screen more than 5 years ago.

INVITE_TYPE

Contails details of all breast screening outcome actions following breast test.

BTW_SCREENS

Code to denote outcome of screening outcome action. Can be joined with SCRN_ACT table; see SCRN_ACT_DESC for explanation of codes.

Breast Test Wales (SBTW)

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