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(1) The number of people with a specific condition or attribute at a specified time divided by the total number of people in the population.
(2) The number or proportion of cases, events or conditions in a given population.
A term defined in the context of a 4-cell diagnostic matrix (2 X 2 table) as the amount of people with a disease, X, relative to a population.

Veterinary medicine
(1) A clinical estimate of the probability that an animal has a given disease, based on current knowledge (e.g., by history of physical exam) before diagnostic testing.
(2) As defined in a population, the probability at a specific point in time that an animal randomly selected from a group will have a particular condition, which is equivalent to the proportion of individuals in the group that have the disease. Group prevalence is calculated by dividing the number of individuals in a group that have a disease by the total number of individuals in the group at risk of the disease. Prevalence is a good measure of the amount of a chronic, low-mortality disease in a population, but is not of the amount of short duration or high-fatality disease. Prevalence is often established by cross-sectional surveys.


percentage or fraction of a whole. Often expressed also as a rate or ratio by comparison to a total or other population.

proportion differences
estimating the significance of differences between two proportional morbidities or mortalities.

Patient discussion about proportion

Q. I have found that my body weight has high proportion of water in total weight.. I have found that my body weight has high proportion of water in total weight, and it makes me to take less water and there by increasing my thirst, which in turn stresses my body a lot, what can I do to reduce this problem…..?

A. Your body has a way of compensating when it is lacking something. When you are dehydrated, your body will retain fluids, hence the excess water.
drink plenty of water daily and you will find that you will lose this puffiness as your body adjusts to getting what it needs.

More discussions about proportion
References in periodicals archive ?
Plus, proportioners are heavy and must be connected to generators, air compressors, or hydraulic systems.
The venturi proportioner draws the fertilizer into the water system through a small tube that connects the water hose to the fertilizer concentrate.
Self-contained modular slip-on fire fighting units consisting of tank, plumbing, reel, foam proportioner control panel, engine and pump that can be easily mounted or removed from a one-ton Cab & Chassis truck equipped with a flat bed.
After discussions with Wilson UK's specialist design engineers, it was decided that an electronic proportioner would be needed to give ratio assurance and accurate pot life management.
Air-driven proportioner allows for ratio change by changing gears on either pump.
Precision Mix II--Electronic plural component proportioner c/w gun flush box and colour change
capacity 8900 Series Proportioner 15 2 part meter mixing units.
Air-driven gerotor proportioner allows for ratio change by changing gears on either pump.