Heat Wave Impacts on Motality in Nanjing,China

A variety of research has linked extreme heat to heightened levels of daily mortality. This paper analyses the relationship between mortality and heat wave (duration of high temperature above 35°C is more than 3 days) in Nanjing ,China. Daily mortality in Nanjing was analysed by cause, from January 2004 to December 2009. When the daily maximum temperature is above 35°C, it is defined as a hot day. Extra mortality was calculated by EM=(D-DNo-heat)/DNo-heat, here EM refers to the extra mortality, D is daily death cases, DNo-heat means the average of death cases in no-heat days ( the daily maximum temperature is lower than 35°C) in summer. Our results showed that impact of heat wave on mortality in all causes. Order of causes in Nanjing is Circulatory, Neoplasm, Respiratory, Endocrine, Digestive, Genitourinary, Nervous, Mental, Infectious, Blood and other diseases. Circulatory cause accounts for 37.44%. Second is Neoplasm, occupying 30.02%. The third is Respiratory, taking by 12.99%. Three causes attribute 80.05%. Heat wave impact the order of causes and extra mortality. The highest five extra mortality are Genitourinary, Infectious, Endocrine, Nervous and mental diseases in heat wave, accounting for 100.4%A97.4%A62.0%A56.1% and 48.6%, respectively. There is an attributable of 13.2% of circulatory causes extra mortality.