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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.
TABLE E4.10
Personnel
Exposure
n
HBV Positive
Physicians
Frequent
81
17
Infrequent
89
7
Nurses
104
22
126
11
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