Expectation of life, free of disability is known as:-
**Core Concept**
The question is testing the understanding of health expectancy measures, which are used to quantify the quality and duration of life. In this context, the term "expectation of life, free of disability" refers to a specific health expectancy measure that estimates the average number of years a person is expected to live without any disability.
**Why the Correct Answer is Right**
This measure is also known as **Disability-Free Life Expectancy (DFLE)**. It is an important indicator of health status, as it takes into account not only the duration of life but also the quality of life. DFLE is calculated by subtracting the average years lived with disability from the total life expectancy. This measure helps policymakers and healthcare providers to identify areas where interventions can be targeted to improve health outcomes and reduce disability.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the expectation of life, free of disability. While life expectancy at birth is an important measure, it does not account for the quality of life.
**Option B:** This option is incorrect because it refers to a different measure of health expectancy. Health-adjusted life expectancy (HALE) is a measure that takes into account the quality of life, but it is not the same as DFLE.
**Option C:** This option is incorrect because it is a type of disability, rather than a measure of health expectancy.
**Clinical Pearl / High-Yield Fact**
Remember that DFLE is an important metric for evaluating the effectiveness of healthcare interventions and policies aimed at improving health outcomes and reducing disability.
**Correct Answer: C. Disability-Free Life Expectancy (DFLE).**