Do grumpy old men have a greater risk of having coronary heart disease than men who aren’t so grumpy? harvard medical school researchers examined this question in a prospective observational study reported in the november 1994 issue of circulation (kawachi et al., 1994). for 7 years, the researchers studied men between the ages of 46 and 90. all study participants completed a survey of anger symptoms at the beginning of the study period. among 199 men who had no anger symptoms, there were 8 cases of coronary

559 - 59 = 500

                      HEART DISEASE

GRUMPY                YES                 NO      TOTAL  

YES                         59                  500       559

NO                           8                     191         199

TOTAL                     67                   691        758      

Based on this graph, it is possible to see that there is a relationship between anger and heart disease, because anger, impatience can cause premature heart attack. Young people with a high level of stress are three times more likely to develop heart disease.

i'd have to with d.

explanation: