Systematic Review of Nature-Based Interventions for Perinatal Depression, Anxiety, and Loneliness.

Background: Perinatal mood and anxiety disorders and social isolation are prevalent and associated with adverse maternal and child health outcomes. We conducted a systematic review to assess the evidence for nature-based interventions (NBIs) to address depression, anxiety, and loneliness among pregnant and postpartum women.

Methods: Studies were identified through MEDLINE, Embase, CINAHL, APA PsycINFO, ClinicalTrials.org, Web of Science, and Cochrane Reviews in February 2023. Included studies were original, peer-reviewed studies published in or translated into English that evaluated an intervention which engaged pregnant or postpartum women directly with nature and used a quantitative outcome measure for anxiety, depression, or loneliness.

Results: Three studies, including 68 pregnant or postpartum women and their family or friends, met our inclusion criteria. Results were synthesized narratively in text and tables. All studies had early-stage designs and relatively small sample sizes. A variety of intervention content and delivery platforms were utilized. Studies were not adequately powered to test or detect statistically significant changes in depression, anxiety, or loneliness. Measurement of nature engagement varied. Using the Downs and Black checklist, we found study quality varied from good to poor.

Discussion: More research is needed to understand the potential benefits of NBIs for perinatal mental health and social wellbeing. Additional study rigor is needed, including the consistent use of validated and well-rationalized measures of nature engagement. Intervention design should consider the varying needs perinatal populations, including barriers to and facilitators of engagement for diverse communities.