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 B
Explanation
A. Reassure the student that it is just a bad cold and will soon pass: This dismisses the symptoms and delays necessary public health intervention.
B. Inform all students, staff, and faculty of a possible measles exposure: Koplik spots (small white spots inside the cheeks) are a classic early sign of measles, which is highly contagious. Prompt notification is needed to prevent an outbreak.
C. Inform all students, staff, and faculty of a possible rubella epidemic: While rubella also causes a rash, it does not present with Koplik spots.
D. Tell the student to take two acetaminophen and drink lots of fluids: Symptomatic relief is important but does not address the risk of measles transmission.
Correct Answer is B
Explanation
A. Putting students on a diet if they weigh greater than 20% of their ideal weight: This is a tertiary prevention strategy, as it focuses on managing obesity after it has been diagnosed rather than early detection.
B. Weighing students to identify those who are overweight: Secondary prevention focuses on early detection and intervention to prevent disease progression. Weighing students allows for early identification of obesity and timely interventions.
C. Giving a presentation on the importance of exercise and physical fitness: This is primary prevention, which aims to prevent obesity before it occurs by promoting healthy habits.
D. Designing a game in which students select healthy food choices: This is also primary prevention, as it promotes healthy behaviors rather than identifying or managing existing obesity.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.