Psychiatric disorders and COPD : response

Related letter(s): Psychiatric Disorders and COPDPsychiatric Disorders and COPD: Still Stronger Evidence for Convincing Policymakers? (Chest. 2013;144(3):1084.) This letter concerns the article(s): Bidirectional Associations Between Clinically Relevant Depression or Anxiety and COPDCOPD Prognosis with Depression or Anxiety: A Systematic Review and Meta-analysis (Chest. 2013;144(3):766-777.) To the Editor: We thank Dr Moullec and colleagues for their interest in, and supportive comments on, our study in this issue of CHEST.1 Generally speaking, we agree with the principle that careful consideration is needed when pooling results from individual studies included in a systematic review. However, the selection of studies is also determined by the research question(s), and our study may have had a wider focus than theirs.2 Our responses to their specific points are as follows.