Fig. 1.

Conditional density plots presenting the relation between heart rate in beats per minute and mortality rate in % in the total and subsamples. Black stripes indicate death events and red lines indicate lowest mortality rate in relation to heart rate for a 64, b 58, c 59, and d 55. Sample sizes and number of deaths were for aN = 14,925 and 714 deaths, bN = 1432 and 214 deaths, cN = 13,233 and 471 deaths, and dN = 3517 and 82 deaths