Objective To analyze the relationship between stroke occurrence and weather conditions during the period of the Shanghai World Exposition (EXPO).
Methods Patients information from April to October 2010 were collected from the Shanghai Stroke Surveillance System, and weather data published by Shanghai Weather Bureau were also retrieved. Data analysis was performed with SPSS17.0.
Results During the Shanghai EXPO, a total of 7 629 stroke cases were recorded. The incidence number of cerebral infarction (CI), intracerebral hemorrhage (ICH), subarachnoid hemorrhage (SAH), and unspecified stroke were 6 021 (78.92%), 1 251 (16.40%), 118 (1.55%), and 239 (3.13%), respectively. From April (only 11 days data available) to October of 2010, the incident count of stroke occurred in each month was 460, 1 194, 1 185, 1 184, 1 175, 1 157, and 1 274. In this period, the highest temperature was 39℃ and the lowest was 8℃. The correlation coefficients of CI occurrence with the lowest temperature, the highest temperature, and air pressure were -0.046, -0.044, and 0.048, respectively (P < 0.001). The correlation coefficients of ICH occurrence with the lowest temperature, the highest temperature, and air pressure were 0.048, 0.047, and -0.046, respectively (P < 0.001).
Conclusion In the period of the Shanghai EXPO, CI cases were the highest occurred stroke, followed by ICH. The total amount of stroke incidents for each month didn't fluctuate apparently. However, CI incidents increased with temperature decreasing and air pressure increasing, and ICH incidents increased with temperature increasing and air pressure decreasing.
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