Expectation of life, free of disability is known as:
**Core Concept**
Expectation of life, free of disability refers to the average number of years an individual is expected to live without any significant disability. This concept is an extension of life expectancy, which only accounts for mortality and does not consider the quality of life. The expectation of life, free of disability is an important metric for understanding the overall health and well-being of a population.
**Why the Correct Answer is Right**
The expectation of life, free of disability is a measure of health expectancy, which is a component of health expectancy theory. Health expectancy theory aims to assess the quality of life by considering the years lived in good health, years lived with a disability, and years of life lost due to premature mortality. This concept is often used in epidemiology and public health to evaluate the effectiveness of healthcare interventions and policies.
**Why Each Wrong Option is Incorrect**
**Option A:** Life expectancy is the average number of years an individual is expected to live, but it does not account for the quality of life or disability. It is a measure of mortality, not health expectancy.
**Option B:** Disability-free life expectancy is a related concept, but it is a specific measure of the number of years an individual is expected to live without any significant disability, whereas expectation of life, free of disability is a broader concept that encompasses health expectancy.
**Option C:** Healthy life expectancy is another related concept, but it is a measure of the number of years an individual is expected to live in good health, whereas expectation of life, free of disability also considers years lived with a disability.
**Clinical Pearl / High-Yield Fact**
Remember that expectation of life, free of disability is an important metric for understanding the overall health and well-being of a population, and it can be used to evaluate the effectiveness of healthcare interventions and policies.
**Correct Answer: D. Disability-free life expectancy.**