Maternity initial assessment indicators by mother’s ethnic group

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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 7 selected7 selectable options)

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Area ( of 1 selected1 selectable options)

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Ethnic group ( of 7 selected7 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 descriptionYearAreaEthnic groupInitial assessment within 10 weeksMental health condition reportedBMI
18,601Number2024WalesAll ethnic groupsYes All antenatal recordsAll antenatal records
5,480Number2024WalesAll ethnic groupsNo All antenatal recordsAll antenatal records
482Number2024WalesAll ethnic groupsGestation week not statedAll antenatal recordsAll antenatal records
24,563Number2024WalesAll ethnic groupsAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024WalesAll ethnic groupsAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024WalesAll ethnic groupsAll antenatal recordsYesAll antenatal records
0 [x]Number2024WalesAll ethnic groupsAll antenatal recordsNoAll antenatal records
0 [x]Number2024WalesAll ethnic groupsAll antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024WalesAll ethnic groupsAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
24,563Number2024WalesAll ethnic groupsAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
379Number2024WalesAll ethnic groupsAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
6,128Number2024WalesAll ethnic groupsAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
4,938Number2024WalesAll ethnic groupsAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
5,409Number2024WalesAll ethnic groupsAll antenatal recordsAll antenatal recordsBMI of 30 and over
931Number2024WalesAll ethnic groupsAll antenatal recordsAll antenatal recordsBMI not stated
17,785Number2024WalesAll ethnic groupsAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
6,778Number2024WalesAll ethnic groupsAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
24,563Number2024WalesAll ethnic groupsAll antenatal recordsAll antenatal recordsAll antenatal records
12,989Number2024WalesWhiteYes All antenatal recordsAll antenatal records
3,343Number2024WalesWhiteNo All antenatal recordsAll antenatal records
242Number2024WalesWhiteGestation week not statedAll antenatal recordsAll antenatal records
16,574Number2024WalesWhiteAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024WalesWhiteAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024WalesWhiteAll antenatal recordsYesAll antenatal records
0 [x]Number2024WalesWhiteAll antenatal recordsNoAll antenatal records
0 [x]Number2024WalesWhiteAll antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024WalesWhiteAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
16,574Number2024WalesWhiteAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
256Number2024WalesWhiteAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
4,154Number2024WalesWhiteAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
3,292Number2024WalesWhiteAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
3,778Number2024WalesWhiteAll antenatal recordsAll antenatal recordsBMI of 30 and over
554Number2024WalesWhiteAll antenatal recordsAll antenatal recordsBMI not stated
12,034Number2024WalesWhiteAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
4,540Number2024WalesWhiteAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
16,574Number2024WalesWhiteAll antenatal recordsAll antenatal recordsAll antenatal records
331Number2024WalesMixed or MultipleYes All antenatal recordsAll antenatal records
95Number2024WalesMixed or MultipleNo All antenatal recordsAll antenatal records
5Number2024WalesMixed or MultipleGestation week not statedAll antenatal recordsAll antenatal records
431Number2024WalesMixed or MultipleAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024WalesMixed or MultipleAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024WalesMixed or MultipleAll antenatal recordsYesAll antenatal records
0 [x]Number2024WalesMixed or MultipleAll antenatal recordsNoAll antenatal records
0 [x]Number2024WalesMixed or MultipleAll antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024WalesMixed or MultipleAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
431Number2024WalesMixed or MultipleAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
11Number2024WalesMixed or MultipleAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
107Number2024WalesMixed or MultipleAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
93Number2024WalesMixed or MultipleAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
100Number2024WalesMixed or MultipleAll antenatal recordsAll antenatal recordsBMI of 30 and over
6Number2024WalesMixed or MultipleAll antenatal recordsAll antenatal recordsBMI not stated
317Number2024WalesMixed or MultipleAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
114Number2024WalesMixed or MultipleAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
431Number2024WalesMixed or MultipleAll antenatal recordsAll antenatal recordsAll antenatal records
927Number2024WalesAsianYes All antenatal recordsAll antenatal records
421Number2024WalesAsianNo All antenatal recordsAll antenatal records
25Number2024WalesAsianGestation week not statedAll antenatal recordsAll antenatal records
1,373Number2024WalesAsianAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024WalesAsianAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024WalesAsianAll antenatal recordsYesAll antenatal records
0 [x]Number2024WalesAsianAll antenatal recordsNoAll antenatal records
0 [x]Number2024WalesAsianAll antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024WalesAsianAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
1,373Number2024WalesAsianAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
38Number2024WalesAsianAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
386Number2024WalesAsianAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
304Number2024WalesAsianAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
161Number2024WalesAsianAll antenatal recordsAll antenatal recordsBMI of 30 and over
30Number2024WalesAsianAll antenatal recordsAll antenatal recordsBMI not stated
919Number2024WalesAsianAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
454Number2024WalesAsianAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
1,373Number2024WalesAsianAll antenatal recordsAll antenatal recordsAll antenatal records
378Number2024WalesBlackYes All antenatal recordsAll antenatal records
302Number2024WalesBlackNo All antenatal recordsAll antenatal records
6Number2024WalesBlackGestation week not statedAll antenatal recordsAll antenatal records
686Number2024WalesBlackAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024WalesBlackAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024WalesBlackAll antenatal recordsYesAll antenatal records
0 [x]Number2024WalesBlackAll antenatal recordsNoAll antenatal records
0 [x]Number2024WalesBlackAll antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024WalesBlackAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
686Number2024WalesBlackAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
10Number2024WalesBlackAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
131Number2024WalesBlackAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
150Number2024WalesBlackAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
143Number2024WalesBlackAll antenatal recordsAll antenatal recordsBMI of 30 and over
12Number2024WalesBlackAll antenatal recordsAll antenatal recordsBMI not stated
446Number2024WalesBlackAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
240Number2024WalesBlackAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
686Number2024WalesBlackAll antenatal recordsAll antenatal recordsAll antenatal records
252Number2024WalesOtherYes All antenatal recordsAll antenatal records
130Number2024WalesOtherNo All antenatal recordsAll antenatal records
1Number2024WalesOtherGestation week not statedAll antenatal recordsAll antenatal records
383Number2024WalesOtherAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024WalesOtherAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024WalesOtherAll antenatal recordsYesAll antenatal records
0 [x]Number2024WalesOtherAll antenatal recordsNoAll antenatal records
0 [x]Number2024WalesOtherAll antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024WalesOtherAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
383Number2024WalesOtherAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
Showing 1 to 100 of 1,764 rows
Page 1 of 18

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 mother’s ethnic group.

This data is derived from the Maternity Indicators dataset, provided to the 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).

The data dictionary also defines how ethnic groups are classified, namely:

  • White (any white background);
  • Asian (Pakistani, Bangladeshi, Chinese, Indian, any other Asian background);
  • Mixed/multiple (white and Asian, white and black African, white and black Caribbean, any other mixed background);
  • Other (any other ethnic group); Black (African, Caribbean, any other black background).
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%). 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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