Which formula should be used to calculate an incidence rate?
Number of true negatives/number of true negatives + number of false positives.
Number of new cases in a period of time/the total population x base multiple of 10.
Number of true positives/number of true positives + number of false negatives.
Number of new cases+ number old cases in a period of time/the total population x base multiple of 10.
The Correct Answer is B
A. Number of true negatives / (true negatives + false positives): This formula is used to calculate specificity, not incidence.
B. Number of new cases in a period of time / total population × base multiple of 10: Incidence rate measures the number of new cases of a disease occurring in a population during a specific period. It is expressed per a base population size (e.g., per 1,000 or 100,000 people) to allow for comparisons across different populations.
C. Number of true positives / (true positives + false negatives): This formula is used to calculate sensitivity, not incidence.
D. Number of new cases + number of old cases in a period of time / total population × base multiple of 10: This describes prevalence, which includes both new and existing cases, not incidence.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Toxicologist: Toxicologists specialize in studying the effects of chemicals on living organisms, including how chemicals interact with biological systems and potential toxic effects.
B. Chemist: A chemist studies the properties, composition, and reactions of substances but may not focus on physiological effects on the body.
C. Epidemiologist: An epidemiologist studies disease patterns in populations, including environmental exposures, but does not specialize in the physiological effects of chemicals.
D. Pharmacist: A pharmacist specializes in medications, including their mechanisms and interactions, but may not have in-depth knowledge of all chemical toxins.
Correct Answer is {"dropdown-group-1":"B","dropdown-group-2":"A","dropdown-group-3":"A"}
Explanation
I. Agent: Plasmodium-Plasmodium is a protozoan parasite responsible for causing malaria. It is the infectious microorganism that leads to disease, making it the agent in this scenario.
II. Host: Human- In malaria transmission, humans serve as the primary host where Plasmodium multiplies and causes illness. The parasite infects red blood cells, leading to symptoms like fever and chills.
III. Environment: Stagnant water- Stagnant water serves as a breeding ground for Anopheles mosquitoes, which are the vectors that transmit Plasmodium to humans. The environment plays a crucial role in maintaining the conditions necessary for disease transmission.
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