In patients who have had a myocardial infarction or revascularization procedure, secondary prevention of coronary artery disease by comprehensive risk factor modification reduces mortality, decreases subsequent cardiac events, and improves quality of life.oronary artery disease (CAD) is the leading cause of death in the United States, with more than 1 million new and recurrent cardiovascular events occurring each year, and its prevalence and impact are expected to grow.
ratio level measurement the highest form of measurement that meets all the rules of other forms of measure; it includes mutually exclusive categories, exhaustive categories, rank ordering, equal spacing between intervals, and a continuum of values. Ratio level measurement also includes a value of zero.
Ratio measurement scales. The last metric scale is called ratio measurement scales. Ratio along with interval scales affords the most precise data. With both there are equal intervals or units between any two consecutive numbers. The only difference between ratio and interval scales is the role of zero (0). In interval scales zero is artificial rather than real. IQ and standardized tests for performance assessment have a zero (0), but it is artificially created rather than real. In ratio scales, zero is real.