JODHPUR AIIMS SNO-2018
Nursing Research & Statistics
Easy
Incidence is defined as?
Appeared in: JODHPUR AIIMS SNO-2018
Explanation
- Incidence is a core concept in epidemiology that specifically measures the occurrence of new cases of a disease or health condition.
- It is always calculated over a specified period of time (e.g., per month, per year) within a defined population that is at risk of developing the disease.
- This measure is a rate that helps to determine a person's probability or risk of being diagnosed with a disease during that time frame.
- Unlike prevalence, incidence is not affected by the duration of the illness; it only captures the moment a new case appears.
Why Other Options Were Wrong
- Option B: This is incorrect because incidence is concerned only with new cases, not old or pre-existing ones. The number of old cases is a component of prevalence.
- Option C: This statement defines point prevalence. Prevalence includes all cases (both new and old) at a specific point in time, whereas incidence only counts new cases over a period.
- Option D: This statement defines period prevalence. It counts all individuals who had the disease at any time during a specified period (e.g., the year 2023), including cases that started before the period and continued into it, as well as new cases.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition of Incidence in Epidemiology as background academic context rather than a clinical decision trigger.
- Nurses and public health officials rely on incidence data to identify disease outbreaks. A sudden spike in the incidence of an infectious disease can signal an epidemic, prompting immediate investigation and control measures.
- Incidence rates are crucial for evaluating the effectiveness of prevention programs. For example, a decrease in the incidence of measles after a vaccination campaign indicates the program's success.
- Understanding incidence helps in health education, allowing nurses to inform communities about their risk of developing certain diseases and the importance of preventive actions.
How to Approach the Question
- This is a factual recall question that tests your knowledge of a fundamental epidemiological term.
- First, identify the keyword in the question stem: 'Incidence'.
- Recall the precise definition of incidence. The key components are 'new cases' and a 'specific period'.
- Systematically evaluate each option against this definition.
- Option A directly matches: 'Number of new cases occurring during a specific period'.
- Eliminate the other options by recognizing that they describe different concepts. Options C and D describe point and period prevalence, respectively, because they refer to 'existing cases' rather than 'new cases'.
Concept Tested & Keywords
- Concept Tested: Definition of Incidence in Epidemiology
- Stem keywords: Incidence, defined as
- Lead-in keywords: BEST, MOST RELEVANT CLUE
- Negative lead-in flag: false
Question ID
QK2p2IW9EgYltSi0L213fp
Reference Book
E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 53-55
E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 2836-2838
Practise the full JODHPUR AIIMS SNO-2018
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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