In a seroepidemiologic survey of health workers representing a spectrum of exposure to blood and patients with hepatitis B virus (HBV), it was found that infection increased as a function of contact. Table E4.10 provides data for hospital workers with uniform socioeconomic status at an urban teaching hospital in Boston, Massachusetts. Calculate the 95% confidence intervals for the proportions of HBV-positive workers in each subpopulation.
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TABLE E4.10
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Personnel
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Exposure
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n
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HBV Positive
|
|
Physicians
|
Frequent
|
81
|
17
|
|
|
Infrequent
|
89
|
7
|
|
Nurses
|
Frequent
|
104
|
22
|
|
|
Infrequent
|
126
|
11
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