Maternity initial assessment indicators by mother’s age

Contents

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

View options

Filters

Data description ( of 2 selected2 selectable options)

Select all Data description|Select None of Data description

Year ( of 9 selected9 selectable options)

Select all Year|Select None of Year

Area ( of 1 selected1 selectable options)

Select all Area|Select None of Area

Age of mother ( of 10 selected10 selectable options)

Select all Age of mother|Select None of Age of mother

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

Select all Initial assessment within 10 weeks|Select None of Initial assessment within 10 weeks

Mental health condition reported ( of 6 selected6 selectable options)

Select all Mental health condition reported|Select None of Mental health condition reported

BMI ( of 8 selected8 selectable options)

Select all BMI|Select None of BMI

Data valuesData descriptionYearAreaAge of motherInitial assessment within 10 weeksMental health condition reportedBMI
18,601Number2024WalesAll agesYes All antenatal recordsAll antenatal records
5,480Number2024WalesAll agesNo All antenatal recordsAll antenatal records
482Number2024WalesAll agesGestation week not statedAll antenatal recordsAll antenatal records
24,563Number2024WalesAll agesAntenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024WalesAll agesAntenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024WalesAll agesAll antenatal recordsYesAll antenatal records
0 [x]Number2024WalesAll agesAll antenatal recordsNoAll antenatal records
0 [x]Number2024WalesAll agesAll antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024WalesAll agesAll antenatal recordsAntenatal records with valid mental health dataAll antenatal records
24,563Number2024WalesAll agesAll antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
379Number2024WalesAll agesAll antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
6,128Number2024WalesAll agesAll antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
4,938Number2024WalesAll agesAll antenatal recordsAll antenatal recordsBMI above 25 and below 30
5,409Number2024WalesAll agesAll antenatal recordsAll antenatal recordsBMI of 30 and over
931Number2024WalesAll agesAll antenatal recordsAll antenatal recordsBMI not stated
17,785Number2024WalesAll agesAll antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
6,778Number2024WalesAll agesAll antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
24,563Number2024WalesAll agesAll antenatal recordsAll antenatal recordsAll antenatal records
16Number2024WalesUnder 16Yes All antenatal recordsAll antenatal records
15Number2024WalesUnder 16No All antenatal recordsAll antenatal records
0 [z]Number2024WalesUnder 16Gestation week not statedAll antenatal recordsAll antenatal records
31Number2024WalesUnder 16Antenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024WalesUnder 16Antenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024WalesUnder 16All antenatal recordsYesAll antenatal records
0 [x]Number2024WalesUnder 16All antenatal recordsNoAll antenatal records
0 [x]Number2024WalesUnder 16All antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024WalesUnder 16All antenatal recordsAntenatal records with valid mental health dataAll antenatal records
31Number2024WalesUnder 16All antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
3Number2024WalesUnder 16All antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
7Number2024WalesUnder 16All antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
6Number2024WalesUnder 16All antenatal recordsAll antenatal recordsBMI above 25 and below 30
4Number2024WalesUnder 16All antenatal recordsAll antenatal recordsBMI of 30 and over
0 [z]Number2024WalesUnder 16All antenatal recordsAll antenatal recordsBMI not stated
20Number2024WalesUnder 16All antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
11Number2024WalesUnder 16All antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
31Number2024WalesUnder 16All antenatal recordsAll antenatal recordsAll antenatal records
638Number2024Wales16 to 19Yes All antenatal recordsAll antenatal records
305Number2024Wales16 to 19No All antenatal recordsAll antenatal records
24Number2024Wales16 to 19Gestation week not statedAll antenatal recordsAll antenatal records
967Number2024Wales16 to 19Antenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024Wales16 to 19Antenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024Wales16 to 19All antenatal recordsYesAll antenatal records
0 [x]Number2024Wales16 to 19All antenatal recordsNoAll antenatal records
0 [x]Number2024Wales16 to 19All antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024Wales16 to 19All antenatal recordsAntenatal records with valid mental health dataAll antenatal records
967Number2024Wales16 to 19All antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
63Number2024Wales16 to 19All antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
280Number2024Wales16 to 19All antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
147Number2024Wales16 to 19All antenatal recordsAll antenatal recordsBMI above 25 and below 30
120Number2024Wales16 to 19All antenatal recordsAll antenatal recordsBMI of 30 and over
44Number2024Wales16 to 19All antenatal recordsAll antenatal recordsBMI not stated
654Number2024Wales16 to 19All antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
313Number2024Wales16 to 19All antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
967Number2024Wales16 to 19All antenatal recordsAll antenatal recordsAll antenatal records
2,713Number2024Wales20 to 24Yes All antenatal recordsAll antenatal records
894Number2024Wales20 to 24No All antenatal recordsAll antenatal records
80Number2024Wales20 to 24Gestation week not statedAll antenatal recordsAll antenatal records
3,687Number2024Wales20 to 24Antenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024Wales20 to 24Antenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024Wales20 to 24All antenatal recordsYesAll antenatal records
0 [x]Number2024Wales20 to 24All antenatal recordsNoAll antenatal records
0 [x]Number2024Wales20 to 24All antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024Wales20 to 24All antenatal recordsAntenatal records with valid mental health dataAll antenatal records
3,687Number2024Wales20 to 24All antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
111Number2024Wales20 to 24All antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
934Number2024Wales20 to 24All antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
638Number2024Wales20 to 24All antenatal recordsAll antenatal recordsBMI above 25 and below 30
812Number2024Wales20 to 24All antenatal recordsAll antenatal recordsBMI of 30 and over
124Number2024Wales20 to 24All antenatal recordsAll antenatal recordsBMI not stated
2,619Number2024Wales20 to 24All antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
1,068Number2024Wales20 to 24All antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
3,687Number2024Wales20 to 24All antenatal recordsAll antenatal recordsAll antenatal records
5,498Number2024Wales25 to 29Yes All antenatal recordsAll antenatal records
1,522Number2024Wales25 to 29No All antenatal recordsAll antenatal records
142Number2024Wales25 to 29Gestation week not statedAll antenatal recordsAll antenatal records
7,162Number2024Wales25 to 29Antenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024Wales25 to 29Antenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024Wales25 to 29All antenatal recordsYesAll antenatal records
0 [x]Number2024Wales25 to 29All antenatal recordsNoAll antenatal records
0 [x]Number2024Wales25 to 29All antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024Wales25 to 29All antenatal recordsAntenatal records with valid mental health dataAll antenatal records
7,162Number2024Wales25 to 29All antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
88Number2024Wales25 to 29All antenatal recordsAll antenatal recordsBMI above 10 and below 18.5
1,717Number2024Wales25 to 29All antenatal recordsAll antenatal recordsBMI above 18.5 and below 25
1,408Number2024Wales25 to 29All antenatal recordsAll antenatal recordsBMI above 25 and below 30
1,666Number2024Wales25 to 29All antenatal recordsAll antenatal recordsBMI of 30 and over
287Number2024Wales25 to 29All antenatal recordsAll antenatal recordsBMI not stated
5,166Number2024Wales25 to 29All antenatal recordsAll antenatal recordsAntenatal records with valid BMI data
1,996Number2024Wales25 to 29All antenatal recordsAll antenatal recordsAntenatal records with invalid BMI data
7,162Number2024Wales25 to 29All antenatal recordsAll antenatal recordsAll antenatal records
6,348Number2024Wales30 to 34Yes All antenatal recordsAll antenatal records
1,682Number2024Wales30 to 34No All antenatal recordsAll antenatal records
147Number2024Wales30 to 34Gestation week not statedAll antenatal recordsAll antenatal records
8,177Number2024Wales30 to 34Antenatal records with valid gestation week dataAll antenatal recordsAll antenatal records
0 [z]Number2024Wales30 to 34Antenatal records with invalid gestation week dataAll antenatal recordsAll antenatal records
0 [x]Number2024Wales30 to 34All antenatal recordsYesAll antenatal records
0 [x]Number2024Wales30 to 34All antenatal recordsNoAll antenatal records
0 [x]Number2024Wales30 to 34All antenatal recordsMental health status not statedAll antenatal records
0 [x]Number2024Wales30 to 34All antenatal recordsAntenatal records with valid mental health dataAll antenatal records
8,177Number2024Wales30 to 34All antenatal recordsAntenatal records with invalid mental health dataAll antenatal records
Showing 1 to 100 of 3,240 rows
Page 1 of 33

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 age.

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)
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

Select the filtered or whole dataset to download

Select download format

Contains only the dataset
Contains only the dataset
Contains only the dataset

Select number formatting

This includes rounding to decimal places and commas to separate thousands
This includes rounding to decimal places and commas to separate thousands

Select language

Metadata

The metadata for this dataset is not included when you download the data. You can download this separately. This contains all the information from the 'About this dataset' tab.

Download metadata