https://www.selleckchem.com/products/vx-561.html 8%). The DF-mot is a valid instrument with good predictive validity in preterm infants, suggesting it can be used as a clinical useful tool to assess motor development. The DF-mot is a valid instrument with good predictive validity in preterm infants, suggesting it can be used as a clinical useful tool to assess motor development. Although the association between long-term exposure to PM and mortality has been evaluated intensively, little is known about the socioeconomic disparity in the association. We collected data on annual all-cause mortality, PM concentration, socioeconomic and demographic characteristics of 2640 counties from the two most recent Chinese censuses in 2000 and 2010. We applied the difference-in-differences (DID) method to estimate PM -mortality association for counties at different quartiles of literacy rate, college rate, urbanization rate and GDP per capita, respectively. Overall, every 10µg/m increase in annual average PM was associated with 3.8% (95% confidence interval [CI] 3.0-5.0) increase of all-cause mortality. The stratified analysis suggested higher health impact of exposure in counties with lower socioeconomic status. For counties of the lowest quartile (Q ) of literacy rate, college rate, urbanization rate and GDP per capita, the effect estimates were 6.0% (95% CI 4.2-7.7), 4.4% (95% CI 2.8-6.0), 3.5% (95% CI 2.0-5.1) and 4.9% (95% CI 2.7-7.1), respectively. There was strong evidence for elevated risk in mortality associated with PM of all socioeconomic factors in the lowest quartile (Q ) compared with the highest quartile counties (Q ) (p-value for difference<0.05). There was socioeconomic disparity in the PM -mortality association in China. Dwellers living in less developed counties are more vulnerable to long-term exposure to ambient PM than those living in developed counties. There was socioeconomic disparity in the PM2.5-mortality association in China. Dwellers living in less de