D-IAPT: Examining the efficacy of internet-delivered interventions for depression and anxiety disorders in IAPT



The study aims to determine the long-term effectiveness and cost-effectiveness of internet-delivered interventions for depression and anxiety disorders at step 2 of IAPT.



A CONSORT compliant single-blinded, parallel-groups, randomised controlled trial design will be used to examine the effectiveness of internet-delivered interventions for depression and anxiety disorders against a waiting list control group. Read the study protocol here.


Berkshire Healthcare NHS Foundation Trust - Talking Therapies IAPT service.


Study outcome measures 

  • MINI diagnostic interview schedule

  • IAPT Minimum Dataset (PHQ-9, GAD-7, IAPT Phobia Scale, WASA)

  • Disorder specific measures (SPIN, PDSS, HAI, PSWQ)

  • Patient Experience Questionnaire

  • Followup Questionnaires

  • STAR-P/C

  • Therapist Behaviours Checklist

  • Semi structured interviews with clinicians


Inclusion Criteria

  • 18 years of age

  • Presence of mild to moderate depressive and/or  anxiety symptoms (PHQ-9 >9; GAD-7 >8)

  • Able to read English

  • Have capacity to consent

  • No psychotic illness or previous diagnosis of organic mental health or substance abuse disorders.

  • Not currently in treatment for depression and/or anxiety.

  • No suicidal ideation.



Additional research projects involving Digital IAPT include:


  • Reasons for ‘Dropping Out’: a qualitative study of the subjective experiences of and reasons for withdrawing from iCBT treatment for depression and anxiety to better understand online treatment attrition.

  • Remission & Relapse: examining the durability of iCBT and the prevalence of remission and relapse rates of service users undergoing iCBT treatment who have recovered from depression and anxiety

  • Therapeutic experience: a qualitative study investigating the therapeutic experience (i.e. expectations, emotional and aesthetic experience as well as lifestyle fit) of service users undergoing iCBT intervention for the purpose of gaining knowledge about the process of psychological and behavioural change, as well as identify any barriers and supports to such.

  • Expectations: exploring the relationship of expectations of iCBT treatment at baseline with treatment outcomes of depression and anxiety

  • Mechanism of Change: examining the effect of rumination and emotional regulation as mechanism of change underlying the effectiveness of iCBT for people with depression and anxiety