True statements about disease prevalence include all of the following except
1. prevalence is the proportion of people in a given population who currently have the disease.
2. prevalence can be estimated from the results of a cross-sectional study.
3. prevalence is approximately equal to the product of the incidence of the disease and its duration.
4. prevalence is a measure of existing cases of the disease at a particular point in time (or over a specified time period), rather than the proportion of new cases that develop during a specified period of time.
5. prevalence will decrease if a new drug reduces mortality associated with the disease, even if it does not result in a cure.

5. Prevalence will decrease if a new drug reduces mortality associated with the disease, even if it does not result in a cure

Explanation: Prevalence or disease prevalence is the number of individuals within a given population infected or showing characteristics feature of a disease or infection. It is an epidermological term expressed statistically in proportion over a population that show signs of a medical condition.

Prevalence estimates or data is used by government agencies, health practitioners, toxicologist, epidermologist, etc.

Types of prevalence includes:

• Life time prevalence.

•Point prevalence.

•,Period prevalence.

5.Prevalence will decrease if a new drug reduces mortality associated with the disease, even if it does not result in a cure.

Explanation: prevalence is the total number of persons infected with a disease within a given population. It is always expressed as a percentage of the total population still infected.Further more,it can be expressed as a product of the incidence and it's duration. If a new drug is developed which does not cure the disease prevalence will either remain the same( if there are other preventive activities) or continue to rise. Prevalence is mathematically expressed as

Prevalence=(number of infected population/total population)*100.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint