We aimed to compare differences in DIALOG scale patient-reported experience measures and patient-reported outcome measures scores between different patient groups accessing adult mental health services. Pooled anonymised data of 11 198 DIALOG scores from 5007 unique patients were disaggregated (based on age, gender, ethnicity and socioeconomic deprivation) and analysed. We compared statistical differences between groups in their means scores, and carried out regression analysis converting data to a binomial for satisfaction to control for variables.

Asian and Black patients had greater levels of satisfaction across several domains compared with White British patients. Women, younger patients and those living in more deprived areas had poorer levels of satisfaction.

Disaggregated large routinely collected outcome data can offer useful intelligence on monitoring of health inequity. Overall health inequity assessment needs a nuanced interpretation and triangulation of outcome data with access experience, including coercion and physical health.

DIALOG is a patient-reported outcome and experience measure. We analysed anonymised DIALOG scores routinely collected from East London NHS Foundation Trust. We aimed to (a) examine changes in DIALOG scores through the patient journey (‘assessment’, ‘review’ and ‘discharge’); and (b) assess the impact of community mental health (CMH) transformation by comparing pre- and post-DIALOG scores. We analysed 11 198 DIALOG scores from 5007 patients in 2018–2019 and 2021–2022.

DIALOG scores improved across treatment stages in both years. There was no clear difference pre- and post-CMH transformation, although in 2021–2022 there were lower satisfaction scores at referral.

DIALOG showed sensitivity to change, supporting the utility of this scale in the evaluation of mental health services. The impact of CMH transformation was difficult to assess, due to potential confounders such as the COVID-19 pandemic. Routinely collected DIALOG data can help evaluate patient outcomes over time and inform service improvements.