广州市空气污染物的浓度与脑卒中发病人数的相关性

Correlation between air pollution and incidence of stroke in Guangzhou

目的：探讨空气污染对广州市居民脑卒中发生的影响.方法：选择2006年8月1日至2007年10月22日广州市急救医疗指挥中心每日脑卒中发病资料数据和同期广东省气象局每日广州市空气污染物浓度的数据（包括二氧化氮、二氧化硫、可吸入颗粒物）.以脑卒中发病人数作为因变量,以污染物的浓度作为自变量,对其分别按日和周发病资料进行直线相关分析.结果：广州市脑卒中的日发病人数与当天的二氧化氮（r=0.122,P〈0.05）、可吸入颗粒物（r=0.1,P〈0.05）呈正相关与二氧化硫没有相关性（P〉0.05）,广州市脑卒中周发病人数与二氧化氮、二氧化硫、可吸入颗粒物的浓度不相关（P〉0.05）.结论：广州地区空气污染物二氧化氮和可吸入颗粒的浓度与脑卒中发病人数呈低度正相关.

Objective：To evaluate the impact of air pollution to the occurrence of stroke in Guangzhou. Methods：Everyday stroke data was obtained from Guangzhou Emergency Center during Aug 1,2006 and Oct 22, 2007 ,and concurrent air pollutant concentrations for NO2, SO2 and respirable particulate matter of Guangzhou were obtained from Guangdong meteorological bureau. Rectilinear correlation analysis to daily and weekly stroke occurrence data was made, with stroke case number as dependent variable, and pollutant concentration as independent variable. Results： Everyday incidence of stroke in Guangzhou was positively correlated with concentrations of NO2 （ r = 0. 122,P 〈 0.05 ） and respirable particulate matter （ r = 0. 1, P 〈 0.05 ） on the same day ,and no correlation with SO2 was observed. No associations were found between the weekly stroke occurrence and air pollutant concentrations of NO2, SO2 and respirable particulate matter （ P 〉 0.05 ）. Conclusions： Concentrations of nitrogen dioxide and respirable particulate matter were mildly positively correlated with the occurrence of stroke in Guangzhou city.