“Nothing about us, without us”: Translation and cultural adaptation of the Thinking Healthy Programme for perinatal depression to Sri Lankan context using a co-designing approach

Introduction
Thinking Healthy Program’ (THP) is an evidence-based psychosocial intervention endorsed by the World Health Organization as the first line of treatment for perinatal depression (PND), especially in low & middle-income countries. Sri Lanka, a low & middle-income country in Southeast Asia, is yet to introduce an intervention to the existing national maternal and child health programme to address PND. The THP is required to be adapted to the Sri Lankan context before implementation.
Objectives
We adapted the THP to the Sri Lankan context. In this article, the process and outcomes of the adaptation of THP is reported.
Methods
The THP materials were adapted using a co-designing approach. Adaptation was carried out in steps including translation & back translation and cultural adaptation of the manual, checking the manual for its face validity, and pre-testing the documents. The adaptation was guide