Study	Reason for exclusion
Gordon 1985	None of the participants met clinical depression criteria according to DSM‐III; the study did not focus on depression.
Light 1986	Participants did not meet DSM‐III criteria for depression.
Moisieva 2018	The study did not have a randomised design.
Momtaz 2015	Results for anxiety and depression were combined, and we received no response from author to our request for raw data.
Singh 1993	Depression was not an inclusion criterion, and participants were not screened for depression at the time of recruitment; the study did not focus on depressed COPD patients.
Strom 1995	Inclusion criteria only focused on COPD; no criteria specified for depression.
Subbe 2004	Depression was not measured by a validated tool. The participants were only asked: "Does feeling low or anxious impair your quality of life?"
Yohannes 2001	Not a randomised controlled trial; this was a single‐blinded open study.

COPD: chronic obstructive pulmonary disease
 DSM‐III: third edition of the Diagnostic and Statistical Manual of Mental Disorders