a decreasing trendp = 0.09
For the total mortality, there was relative increasing trend with cyclical variation (stationary R-squared 0.74, p = 0.09), in-hospital mortality showed a decreasing trend after the year of 2014 (Stationary R-squared 0.76, p = 0.09) and prehospital mortality showed increasing trend (stationary R-squared 0.73, R square 0.29, p = 0.73 and 0 outliers).