Physicians are in a unique position to be first-hand observers of the effects of environmental factors on population health. As a source of information which is highly trusted, they are also well-suited to raise awareness about the linkages between ecosystem and population health. Yet, current clinical practice in many parts of the world rarely includes environmental health assessments and patient education. The empirical evidence on the reasons for this lack of engagement is limited by the small number of studies published, its narrow geographical scope and the dearth of multivariate statistical analysis. This study used a mixed-methods approach to investigate the determinants of whether physicians at selected hospitals in Thailand assess the environmental history of their patients and provide environmental health advice. Using an ordered logistic regression model, it was found that physicians' engagement was associated with their knowledge, personal motivation, perception of being supported by senior staff and ability to discuss with colleagues. According to key informants, possible remedies for the observed lack of physicians' engagement include revisions of the medical school curriculum, clear strategies for addressing eco-health linkages in the clinical context at the national and hospital level, and better cooperation between relevant government institutions in Thailand.
