Letters to the Editor: Request for Clarification on Methods and Interpretation: Comment on Shaughnessy et al. (2025)

Green, blue, and gray spaces and associations with mental health are important, also when considering the One Health approach and given the increasing prevalence of mental health problems worldwide. In a journal club seminar for students of the Environmental Medicine module of the interdisciplinary International Masters in Environmental Science (IMES) program at the University of Cologne, several points of context, correction, interpretation, and extension of findings are identified from the study 'Longitudinal effects of green, blue, and gray spaces on early adolescent mental health in the United States'. These points correspond to key elements of environmental epidemiology; namely, study population, exposure, outcomes, and interpretation of findings. This letter highlights where interpretation and communication of study context and results can be improved to facilitate comparisons with other studies.