School of Public Health, The University of Hong Kong, Hong Kong SAR, China.
School of Public Health, The University of Hong Kong, Hong Kong SAR, China.
Environ Pollut. 2015 Oct;205:357-64. doi: 10.1016/j.envpol.2015.06.007. Epub 2015 Jun 28.
Interactions between particulate matter with aerodynamic diameter less than or equal to 2.5 μm (PM2.5) and temperature on mortality have not been well studied, and results are difficult to synthesize. We aimed to assess modification of temperature on the association between PM2.5 and cause-specific mortality by stratifying temperature into low, medium, and high stratum in Hong Kong, using data from 1999 to 2011. The mortality effects of PM2.5 were stronger in low temperature stratum than those in high. The excess risk (%) per 10 μg/m(3) increase in PM2.5 at lag 0-1 in low temperature stratum were 0.94% (95% confidence interval: 0.65, 1.24) for all natural, 0.88% (0.38, 1.37) for cardiovascular, and 1.15% (0.51, 1.79) for respiratory mortality. We found statistically significant interaction of PM2.5 and temperature between low and high temperature stratum for all natural mortality. Our results suggested that temperature might modify mortality effects of PM2.5 in Hong Kong.
细颗粒物（PM2.5）与温度对死亡率的相互影响尚未得到很好的研究，并且结果也难以综合。我们的目的是通过将温度分为低、中、高温区，评估香港地区温度对 PM2.5 与特定原因死亡率之间关联的修饰作用，研究数据来自 1999 年至 2011 年。PM2.5 的死亡率效应在低温区比高温区更强。在低温区，滞后 0-1 天内 PM2.5 每增加 10μg/m3，总自然死亡率、心血管死亡率和呼吸死亡率的超额风险（%）分别为 0.94%（95%置信区间：0.65，1.24）、0.88%（0.38，1.37）和 1.15%（0.51，1.79）。我们发现 PM2.5 和温度之间存在具有统计学意义的交互作用，特别是在低温区和高温区之间的总自然死亡率。我们的结果表明，温度可能会修饰香港地区 PM2.5 的死亡率效应。
