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SOLUTIONS TO BIOSTATISTICS PRACTICE PROBLEMS
A sample of 107 patients with one-vessel coronary artery disease was given percutaneous transluminal coronary angioplasty (PTCA). Patients were given exercise tests at baseline and after 6 months of follow up. Exercise tests were performed up to maximal effort until symptoms, such as angina, were present. A paired t-test was used to assess whether
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