A clinical study is established to determine if the results of a screening stress test can be used as a predictor of the presence of heart disease. The study enrolls 100 participants who undergo a screening stress test and then have their disease state confirmed by an angiogram (gold standard).
- Twenty participants screened positive with their stress tests and had confirmed heart disease on their angiogram.
- One participant who screened positive on his stress test had a normal angiogram and did not have heart disease.
- Seventy-seven participants screened negative on their stress tests and had normal angiograms without heart disease.

what is the study indicate ?