environmental (redirected from environmental variance)

environmental

pertaining to or emanating from the environment.

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environmental injuries

include burns, electrical injuries, frostbite, heat stroke.

environmental mastitis

mastitis caused by Escherichia coli, Klebsiella spp., Aerobacter aerogenes.

permanent environmental factors

factors which affect all measures of performance equally and through the patient's lifetime, e.g. fulltime at pasture, tropical climate.

environmental pollution

the presence of offensive, but not necessarily infectious, matter in the environment. For example, pollution may be by specific organic or inorganic chemicals, by physical agents such as dust, volcanic fallout, smoke, automobile fumes, radioactive material and animal feces and urine. Each of these items and noise pollution is dealt with under specific headings.

environmental stress

see stress (2).

temporary environmental factors

risk factors which may vary widely, e.g. nutrition, pregnancy status, disease.

environmental variance

that portion of the phenotypic variance caused by differences in the environment to which the individuals have been exposed.

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Patient discussion about environmental variance.

Q. What are the environmental factors that cause allergies? Are the causes to allergies only genetic or sporadic or is there an environmental connection as well?

A. Exposure to environmental allergens, especially in early life, is an important risk factor for allergy. Also, children that live in large families or overcrowded households, or attend day care, have a reduced incidence of allergic disease, a relationship has been proposed between exposures to bacteria and viruses during childhood, and protection against the development of allergy, which has been called – the "hygiene hypothesis".

Q. Do environmental factors have a relation to developing ADHD as a child? I have read in a magazine that ADHD is thought to be caused by factors from out environment. Is this true?

A. ADHD has mainly a genetic connection, however some environmental factors due play a role: smoking and drinking alcohol during pregnancy is thought to be one trigger. A systematic review found that removing artificial food coloring had a small effect size on ADHD symptoms. Premature birth is also thought to be one of the risk factors.

Q. Is bipolar disorder genetic or environmental? Does anyone know why it seems that all the mental disorders involve chemical imbalances, like the dopamine hypothesis, and serotonin and all that? Psychologists always say its Genetics, though it really seems environmental factors play the biggest role. I honestly think that almost all personality, mood, and psychotic disorders are not cause by genetics, but the way people were raised and the kind of life they lead

A. Like always the answer is complicated…when I looked it up in PubMed I found articles that proved it to be genetic and some that proved it to be environmental. Let’s just say that if you have the genetic tendency to develop bipolar syndrome- all you need is an environmental trigger.