the corresponding ecg signal values giving the distances v n the result of this procedure is shown as an area plot with basis on the zero line fig3 a example probability mass distribution used when calculating standard skewness and kurtosis measures b modified frequency distribution used in this study for calculating the modified skewness and kurtosis measures signal values v n are shown in fig2 s 2 skewness evaluated from tstart to tend with ttop as mean s 3 skewness evaluated in a symmetric interval 10 of the tstart tend interval surrounding ttop with ttop as mean s 4 skewness evaluated in a symmetric interval 20 of the tstart tend interval surrounding ttop wit ttop as mean s 5 ratio of the tine interval from tstart to ttop and the time interval from ttop to tend s 6 ratio of the average slope from tstart to ttop and from ttop to tend f 3 kurtosis evaluated from tstart to tend with ttop as mean f 5 kurtosis evaluated in a symmetric interval 10 of the tstart tend interval surrounding ttop with ttop as mean f 7 kurtosis evaluated in a symmetric interval 20 of the tstart tend interval surrounding ttop with ttop as mean f 8 kurtosis normalized by the value of rtop with ttop as mean f 9 ratio of the total area under the t wave from tstart to ttop and the corresponding time interval f 11 ratio of the total area under the t wave from ttop to tend and the corresponding time interval f 13 ratio of the total area under the t.