Relation between number of different screening tests ordered and percentage of normal people with at least one abnormal test result^[1]

Number of tests	People with at least 1 abnormality (%)
1	5
5	23
20	64
100	99.4

Data from:

Sackett DL. Clinical diagnosis and the clinical laboratory. Clin Invest Med 1978; 1:37.

Reproduced with permission from: Prevention. In: Clinical Epidemiology: The Essentials, 6th ed, Fletcher G (Ed), Lippincott Williams and Wilkins 2020.

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Relation between number of different screening tests ordered and percentage of normal people with at least one abnormal test result[1]

Relation between number of different screening tests ordered and percentage of normal people with at least one abnormal test result^[1]