Does anger level affect the risk of coronary heart disease? An observational study followed a random sample of 8,474 persons for 4 years. Each study participant was classified as either low, moderate or high in anger and whether or not they experienced any coronary heart disease during the study period. Round each risk value to 3 decimal places. low moderate high anger anger anger total yes heart disease 53 110 27 190 no heart disease 3,057 4,621 606 8,284 total 3,110 4,731 633 8,474