Investigators studied 250 workers exposed to lead in glass making operations. Bl

Question

Investigators studied 250 workers exposed to lead in glass making operations. Blood lead levels were measured. 113 workers showed blood lead levels greater than or equal to 40 units and 113 workers show blood lead levels less than 40 units. Subjects were then followed for five years to determine incidence of lead poisoning. The occurrence of lead poisoning within 5 years is cross tabulated according to blood lead levels in the table below.

If this represents a simple random sample of like workers with exposure to lead:

Explanation / Answer

1. Calculate the prevalence of lead exposure in the worker population as a whole. 137/250=54.8% 2. Calculate the incidence of lead poisoning in the worker population as a whole. 124/250=49.6% 3. What percent of lead exposed workers experienced lead poisoning? 107/137 What percent of non-exposed workers experienced lead poisoning? What type of conditional percents are these? 17/113 4. Calculate the relative risk of lead poisoning associated with lead exposure. 107/137 5. Calculate the odds ratio of lead poisoning associated with lead exposure. 107/137 Why is this OR larger than the RR calculated in part d of the exercise?same

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