26 ** Please only answer this question if you have experience in Epidemiology an

Question

26 ** Please only answer this question if you have experience in Epidemiology and can thoroughly understand the mathematics and properly answer the question**


Researchers conducted a study to investigate the relationship between the mean arsenic concentration in public drinking water supplies and mortality rates from circulatory diseases in 30 U.S. counties from 1968 to 1984. Mean arsenic levels ranged from 5.4 to 91.5 micrograms/l. Standardized mortality ratios (SMRs) for diseases of arteries, arterioles, and capillaries (DAAC) for counties exceeding 20 micrograms/l were 1.9 (90% confidence interval [CI] = 1.7-2.1) for females and 1.6 (90% CI = 1.5-1.8) for males.

What kind of study is this?


Answer

1. Prospective Cohort
2. Retrospective Cohort
3. Community Intervention
4. Case-Control
5. Ecologic
6. Cross-Sectional
7. Quasi-Experimental

Explanation / Answer

Researchers conducted a study to investigate the relationship between the mean arsenic concentration in public drinking water supplies and mortality rates from circulatory diseases in 30 U.S. counties from 1968 to 1984. Mean arsenic levels ranged from 5.4 to 91.5 micrograms/l. Standardized mortality ratios (SMRs) for diseases of arteries, arterioles, and capillaries (DAAC) for counties exceeding 20 micrograms/l were 1.9 (90% confidence interval [CI] = 1.7-2.1) for females and 1.6 (90% CI = 1.5-1.8) for males.

What kind of study is this?

Answer

1. Prospective Cohort
2. Retrospective Cohort
3. Community Intervention
4. Case-Control
5. Ecologic
6. Cross-Sectional
7. Quasi-Experimental

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