adaptation and reliability of neighborhood environment walkability scale (news) for iran: a questionnaire for assessing environmental correlates of physical activity

background: in spite of the increased range of inactivity and obesity among iranian adults, insufficient research has been done on environmental factors influencing physical activity. as a result adapting a subjective (self-report) measurement tool for assessment of physical environment in iran is critical. accordingly, in this study neighborhood environment walkability scale (news) was adapted for iran and also its reliability was evaluated.   methods: this study was conducted using a systematic adaptation method consisting of 3 steps: translate-back translation procedures, revision by a multidisciplinary panel of local experts and a cognitive study. then news-iran was completed among adults aged 18 to 65 years (n=19) with an interval of 15 days. intra-class coefficient (icc) was used to evaluate the reliability of the adapted questionnaire.   results: news-iran is an adapted version of news-a (abbreviated) and in the adaptation process five items were added from other versions of news, two subscales were significantly modified for a shorter and more effective questionnaire, and five new items were added about climate factors and site-specific uses. news-iran showed almost perfect reliability (iccs: more than 0.8) for all subscales, with items having moderate to almost perfect reliability scores (iccs: 0.56-0.96).   conclusion: this study introduced news-iran, which is a reliable version of news for measuring environmental perceptions related to physical activity behavior adapted for iran. it is the first adapted version of news which demonstrates a systematic adaptation process used by earlier studies. it can be used for other developing countries with similar environmental, social and cultural context.