Maternity initial assessment indicators by local health board

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Standard shorthand is used in this table: [x] = not available, [z] = not applicable.

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Data description ( of 2 selected2 selectable options)

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Year ( of 9 selected9 selectable options)

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Area ( of 10 selected10 selectable options)

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Initial assessment within 10 weeks ( of 6 selected6 selectable options)

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Mental health condition reported ( of 6 selected6 selectable options)

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BMI ( of 8 selected8 selectable options)

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Data valuesData descriptionYearAreaInitial assessment within 10 weeksMental health condition reportedBMI
18,601Number2024WalesYes All antenatal recordsAll antenatal records
5,480Number2024WalesNo All antenatal recordsAll antenatal records
482Number2024WalesGestation week not statedAll antenatal recordsAll antenatal records
24,563Number2024WalesAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024WalesAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024WalesAll antenatal recordsYesAll antenatal records
0 [x]Number2024WalesAll antenatal recordsNoAll antenatal records
0 [x]Number2024WalesAll antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024WalesAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
24,563Number2024WalesAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
379Number2024WalesAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
6,128Number2024WalesAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
4,938Number2024WalesAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
5,409Number2024WalesAll antenatal recordsAll antenatal recordsBMI of 30 and over
931Number2024WalesAll antenatal recordsAll antenatal recordsBMI not stated
17,785Number2024WalesAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
6,778Number2024WalesAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
24,563Number2024WalesAll antenatal recordsAll antenatal recordsAll antenatal records
4,070Number2024Betsi Cadwaladr University Local Health BoardYes All antenatal recordsAll antenatal records
1,060Number2024Betsi Cadwaladr University Local Health BoardNo All antenatal recordsAll antenatal records
23Number2024Betsi Cadwaladr University Local Health BoardGestation week not statedAll antenatal recordsAll antenatal records
5,153Number2024Betsi Cadwaladr University Local Health BoardAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024Betsi Cadwaladr University Local Health BoardAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsYesAll antenatal records
0 [x]Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsNoAll antenatal records
0 [x]Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
5,153Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
127Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
1,681Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
1,337Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
1,464Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsAll antenatal recordsBMI of 30 and over
63Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsAll antenatal recordsBMI not stated
4,672Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
481Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
5,153Number2024Betsi Cadwaladr University Local Health BoardAll antenatal recordsAll antenatal recordsAll antenatal records
126Number2024Powys Teaching Local Health BoardYes All antenatal recordsAll antenatal records
49Number2024Powys Teaching Local Health BoardNo All antenatal recordsAll antenatal records
0 [z]Number2024Powys Teaching Local Health BoardGestation week not statedAll antenatal recordsAll antenatal records
175Number2024Powys Teaching Local Health BoardAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024Powys Teaching Local Health BoardAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
47Number2024Powys Teaching Local Health BoardAll antenatal recordsYesAll antenatal records
115Number2024Powys Teaching Local Health BoardAll antenatal recordsNoAll antenatal records
13Number2024Powys Teaching Local Health BoardAll antenatal recordsMental health status not statedAll antenatal records
175Number2024Powys Teaching Local Health BoardAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
0 [z]Number2024Powys Teaching Local Health BoardAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
5Number2024Powys Teaching Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
87Number2024Powys Teaching Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
45Number2024Powys Teaching Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
23Number2024Powys Teaching Local Health BoardAll antenatal recordsAll antenatal recordsBMI of 30 and over
0Number2024Powys Teaching Local Health BoardAll antenatal recordsAll antenatal recordsBMI not stated
160Number2024Powys Teaching Local Health BoardAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
15Number2024Powys Teaching Local Health BoardAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
175Number2024Powys Teaching Local Health BoardAll antenatal recordsAll antenatal recordsAll antenatal records
2,187Number2024Hywel Dda University Local Health BoardYes All antenatal recordsAll antenatal records
472Number2024Hywel Dda University Local Health BoardNo All antenatal recordsAll antenatal records
1Number2024Hywel Dda University Local Health BoardGestation week not statedAll antenatal recordsAll antenatal records
2,660Number2024Hywel Dda University Local Health BoardAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024Hywel Dda University Local Health BoardAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
775Number2024Hywel Dda University Local Health BoardAll antenatal recordsYesAll antenatal records
1,715Number2024Hywel Dda University Local Health BoardAll antenatal recordsNoAll antenatal records
170Number2024Hywel Dda University Local Health BoardAll antenatal recordsMental health status not statedAll antenatal records
2,660Number2024Hywel Dda University Local Health BoardAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
0 [z]Number2024Hywel Dda University Local Health BoardAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
56Number2024Hywel Dda University Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
876Number2024Hywel Dda University Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
672Number2024Hywel Dda University Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
795Number2024Hywel Dda University Local Health BoardAll antenatal recordsAll antenatal recordsBMI of 30 and over
91Number2024Hywel Dda University Local Health BoardAll antenatal recordsAll antenatal recordsBMI not stated
2,490Number2024Hywel Dda University Local Health BoardAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
170Number2024Hywel Dda University Local Health BoardAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
2,660Number2024Hywel Dda University Local Health BoardAll antenatal recordsAll antenatal recordsAll antenatal records
2,211Number2024Swansea Bay University Local Health BoardYes All antenatal recordsAll antenatal records
678Number2024Swansea Bay University Local Health BoardNo All antenatal recordsAll antenatal records
1Number2024Swansea Bay University Local Health BoardGestation week not statedAll antenatal recordsAll antenatal records
2,890Number2024Swansea Bay University Local Health BoardAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024Swansea Bay University Local Health BoardAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
1,036Number2024Swansea Bay University Local Health BoardAll antenatal recordsYesAll antenatal records
1,803Number2024Swansea Bay University Local Health BoardAll antenatal recordsNoAll antenatal records
51Number2024Swansea Bay University Local Health BoardAll antenatal recordsMental health status not statedAll antenatal records
2,890Number2024Swansea Bay University Local Health BoardAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
0 [z]Number2024Swansea Bay University Local Health BoardAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
63Number2024Swansea Bay University Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
950Number2024Swansea Bay University Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
712Number2024Swansea Bay University Local Health BoardAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
712Number2024Swansea Bay University Local Health BoardAll antenatal recordsAll antenatal recordsBMI of 30 and over
261Number2024Swansea Bay University Local Health BoardAll antenatal recordsAll antenatal recordsBMI not stated
2,698Number2024Swansea Bay University Local Health BoardAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
192Number2024Swansea Bay University Local Health BoardAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
2,890Number2024Swansea Bay University Local Health BoardAll antenatal recordsAll antenatal recordsAll antenatal records
0 [z]Number2024Abertawe Bro Morgannwg University Local Health BoardYes All antenatal recordsAll antenatal records
0 [z]Number2024Abertawe Bro Morgannwg University Local Health BoardNo All antenatal recordsAll antenatal records
0 [z]Number2024Abertawe Bro Morgannwg University Local Health BoardGestation week not statedAll antenatal recordsAll antenatal records
0 [z]Number2024Abertawe Bro Morgannwg University Local Health BoardAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024Abertawe Bro Morgannwg University Local Health BoardAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024Abertawe Bro Morgannwg University Local Health BoardAll antenatal recordsYesAll antenatal records
0 [z]Number2024Abertawe Bro Morgannwg University Local Health BoardAll antenatal recordsNoAll antenatal records
0 [z]Number2024Abertawe Bro Morgannwg University Local Health BoardAll antenatal recordsMental health status not statedAll antenatal records
0 [z]Number2024Abertawe Bro Morgannwg University Local Health BoardAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
0 [z]Number2024Abertawe Bro Morgannwg University Local Health BoardAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
Showing 1 to 100 of 3,240 rows
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Next update expected:August 2026

Updates

19th December 2025
Dataset first published.

Main information

Designation
Accredited official statistics
Data provider
Digital Health and Care Wales (DHCW)
Data source
Maternity Indicators Dataset (MIDS)

Overview

Summary of dataset and variables

Information recorded at initial assessment on Body Mass Index (BMI), whether the mother reported a mental health condition and whether the initial assessment took place within 10 completed weeks of gestation broken down by local health board.

This data is derived from the Maternity Indicators dataset, provided to Welsh Government by Digital Health and Care Wales (DHCW).

The Maternity Indicators dataset combines records from a mother’s initial assessment with a child’s birth record.

Full details of every data item available in the Maternity Indicators dataset are available through the NHS Wales Data Dictionary.

Gestational age is estimated from when pregnancy started, based on either date of last menstrual period or from an ultrasound scan.

The mental health conditions listed on the record are categorised as:

  • puerperal psychosis (severe postnatal depression)
  • bi-polar effective disorder/manic depression
  • psychosis
  • psychotic depression
  • schizophrenia
  • and other (any other mental health condition).
Data collection or calculation

Data from the Maternity Indicators dataset only includes initial assessment data where the initial assessment and birth both occurred in the same health board, in Wales only. Births to Welsh resident mothers who gave birth in England or in any other country outside of Wales are not included in the data.

Data for each calendar year refers to when the baby was born. Initial assessments may have taken place in the previous year but would be counted in the year in which the birth occurred.

Some women may have had their first initial assessment before the date that has been recorded. The merging methodology for the initial assessment and birth record is based on when these occur in the same health board. It is possible that a mother could have an initial assessment in one health board, early in the pregnancy, but then if she gives birth in another health board she will have another initial assessment recorded at the second health board where she gives birth. A small proportion of initial assessments (1%) were recorded between 39 and 40 weeks.

The percentages are calculated using a denominator of all records minus “not stated”. For gestational age, ‘Not stated’ also includes records where the gestation was stated as 0 weeks.

Records where BMI, height or weight are unrealistic values are classed as invalid, for example where BMI is less than 10 or greater than 100; where the pregnant woman’s weight is less than 30kg or more than 250kg; and where the pregnant woman’s height was less than 120cm or greater than 200cm.

The calculation also only includes women who had their initial assessment at 14 completed weeks of pregnancy or earlier. This is to reduce unfair comparisons where the BMI calculation is affected by baby growth where the initial assessment happened after 15 weeks. Between 11% to 15% of all pregnancies have been excluded for this reason in each year.

The number of records excluded can be found in Table 4 of the Maternity and birth statistics quality report tables.

Statistical quality

For BMI, more than 90% of records had valid data for both height and weight data items, across all health boards, in most years apart from: Cwm Taf in 2016 (77%) and in 2019 (88%); and Betsi Cadwaladr in 2019 (89%). In 2024, Aneurin Bevan has been excluded from analysis due to high levels of invalid data for height leading to 77% missing data for BMI.

For mental health condition at initial assessment, Betsi Cadwaladr and Cwm Taf/Cwm Taf Morgannwg have been excluded for the years 2016 to 2023 because of their low reliability. While 99% of records had valid data entered in both health boards, the large majority were recorded as having no mental health condition which is unlikely to reflect the actual position in these health boards.

All other health boards have valid data for the mental health data item in at least 88% of records in each year, apart from Cardiff and Vale in 2016 (56% completeness). In 2024, Aneurin Bevan have been excluded due to high levels of missing data (76%).

From 1st April 2019 health service provision for residents of Bridgend local authority moved from Abertawe Bro Morgannwg to Cwm Taf. The health board names changed to Cwm Taf Morgannwg University Health Board and Swansea Bay University Health Board. Data for Abertawe Bro Morgannwg and Cwm Taf are available for previous years in this table. More detailed information on the sources of data and analyses in this statistical release are provided in the quality report.

Related reports

Published by

Organisation
Welsh Government
Contact email
stats.healthinfo@gov.wales

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