“…Two variables relating to level of urban economic development were also included; Gross Domestic Product (GDP) per capita (o 40,000, 40,000-49,999, 50,000 þ yuan) and disposable income per household (o 20,000, 20,000-29,999, 30,000 þ yuan). Living in a high income community has been found to be protective of smoking in China (Cai et al, 2013), independent of individual income characteristics, which have also been shown to be important (Yong et al, 2013). The city-level and provincial data were obtained from the National Bureau of Statistics (2013).…”