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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	Frequent	104	22
	Infrequent	126	11

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