Publication, Part of Statistics on Local Stop Smoking Services in England
Statistics on Local Stop Smoking Services in England, April 2025 to March 2026 (Q4, Annual)
Official statistics
Part 4 - Data Quality
Data Quality
This section presents information for a variety of data quality measures for 2025/26 and across the previous 11 years. For further information about data quality measures, please consult the Data Quality Statement, which accompanies this publication.
Proportion of unknown data items
The proportion of quit attempts where the outcome is unknown/lost to follow up is 20.6% in 2025/26. This has increased for the fifth year in a row from 15.8% in 2020/21, and is higher than the last financial year before the COVID-19 pandemic, 2019/20 (19.3%). Before 2020/21, the proportion of quit attempts where the outcome is unknown had decreased annually from 23% in 2014/15.
The proportion of records with a missing socio-economic code is 12.8% in 2025/26. This figure has decreased from 13.5% in 2024/25.
There was a sharp increase in the proportion of records with an intervention setting categorised as 'Other' from 2019/20 to 2021/22, from 3.2% to 11.6%. This coincided with the COVID-19 pandemic. The proportion of records with an intervention setting categorised as 'Other' has decreased to 8.1% in 2025/26 from 11.7% in 2024/25.
The proportion of records where ethnic group was not stated increased gradually from 2019/20 (4.3%) until it dropped to 6.3% in 2023/24 from 6.6% in 2022/23. However, this has increased to 7.6% in 2025/26 from 6.8% in 2024/25.
Non-submitting local authorities
One LA did not submit data for one or more quarters in 2025/26. Some non-submitting LAs will still be running Stop Smoking Services but not submitting data. Some LAs will no longer be running Stop Smoking Services. For other non-submitting LAs it is not possible to ascertain which category the LA falls into. The non-submitting LAs in 2025/26 are:
- Isles of Scilly
The stop smoking services for the Isles of Scilly residents are provided by Cornwall council therefore they have submitted a nil return.
See table 4.3 for further information.
No estimates have been made for the LAs not submitting data.
Last edited: 23 July 2026 9:31 am