urban traffic-related determinants of health questionnaire (utdhq): an instrument developed for health impact assessments

background :traffic and transport is a substantial part of a range of economic, social and environmental factors distinguished to have impact on human health. this paper is a report on a preliminary section of a health impact assessment (hia) on urban traffic and transport initiatives, being conducted in sanandaj, iran. in this preliminary study, the psychometric properties of urban traffic related determinants of health questionnaire (utdhq) were investigated.   methods : multistage cluster sampling was employed to recruit 476 key informants in sanandaj from april to june 2013 to participate in the study. the development of utdhq began with a comprehensive review of the literature. then face, content and construct validity as well as reliability were determined.   results : exploratory factor analysis showed optimal reduced solution including 40 items and 8 factors. three of the factors identified were physical environment, social environment, public services delivery and accessibility. utdhq demonstrated an appropriate validity, reliability, functionality and simplicity.   conclusion : despite the need for further studies on utdhq, this study showed that it can be a practical and useful tool for conducting hias in order to inform decision makers and stakeholders about the health influences of their decisions and measures.