The mortality rate from disease X in city A is 60/100,000 in persons 50+ years old. The mortality rate from the same disease in city B is 120/100,000 in persons 50+ years old.
1. Is the inference correct that disease X is two times more prevalent in persons 50+ years old in city B than it is in persons 50+ years old in city A? Why or why not?
In 2000, there were 65,000 deaths due to lung disease in cigarette smokers aged 20-64 years. The expected number of deaths among cigarette smokers based on age-specific death rates from lung diseases in all females aged 20-64 years was 15,000 during 1995.
2. What was the standardized mortality ratio (SMR) for lung diseases in cigarette smokers?
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