Quality Control in Clinical Trials
Quality Control in Clinical Trials
Quality Control in Clinical Trials
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3. Less often but more concern<strong>in</strong>g are<br />
systematic differences <strong>in</strong> measurement<br />
techniques associated with participant<br />
characteristics: obese or unfit<br />
persons allowed to hold hand rails <strong>in</strong><br />
exercise test<strong>in</strong>g; persons with<br />
emphysema permitted to shorten<br />
exhalation time <strong>in</strong> spirometry test<strong>in</strong>g