Calculate proportion of hbv-positive workers each subgroup

Reference no: EM13953190

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 E1.36 provides data for hospital workers with uniform socioeconomic status at an urban teaching hospital in Boston, Massachusetts.

TABLE E1.36
Personnel	Exposure	n	HBV Positive
Physicians	Frequent	81	17
	Infrequent	89	7
Nurses	Frequent	104	22
	Infrequent	126	11

(a) Calculate the proportion of HBV-positive workers in each subgroup.

(b) Calculate the odds ratios associated with frequent contacts (com- pared to infrequent contacts). Do this separately for physicians and nurses.

(c) Compare the two ratios obtained in part (b). A large difference would indicate a three-term interaction or effect modification, where frequent effects are different for physicians and nurses.

(d) Assuming that the odds ratios for the two groups, physicians and nurses, are equal (in other words, type of personnel is not an effect modifier), calculate the Mantel-Haenszel estimate of this common odds ratio.

Reference no: EM13953190

Questions Cloud

Explain fingerprinting method - cyanoacrylate fuming : Explain the following for each fingerprinting method: Cyanoacrylate fuming, Visualization/lifting in blood, Visualization/lifting on tape and Visualization/lifting on human skin

How do jails differ from prisons : How do jails differ from prisons? What is the relationship between jails and prisons, as they relate to community corrections

To find the cumulative distribution function of y : Use the method of transformations to find the probability density function of Y.

Explain the consensus and conflict views of crime : Explain the consensus and conflict views of crime. Compare and contrast the two. Provide an argument for the United States either having a consensus of conflict society

Calculate proportion of hbv-positive workers each subgroup : Compare the two ratios obtained in part (b). A large difference would indicate a three-term interaction or effect modification, where frequent effects are different for physicians and nurses.

Statement of cash flows using a work sheet : Statement of Cash Flows Using a Work Sheet-Indirect Method (Appendix)

Identify and eliminate dominated strategies : Identify and eliminate dominated strategies and reduce the game to a 2x2 game.

Calculate the generalized odds and give your interpretation : Each of the 6815 subjects above is considered as belonging to one of the three groups defined by the number of cups of coffee consumed per day (the three columns). Calculate for each of the three groups the proportion of subjects admitted because ..

Generating new qualitative approaches : Bulsara (n.d.) explained that mixed-method approaches involve "integrating quantitative and qualitative approaches to generating new qualitative approaches to generating new knowledge

User Account

All Pages