background rate

background rate

the rate, often low, at which some event or agent occurs, at a particular time or in a particular place, in the absence of a specific hazard.
References in periodicals archive ?
PARIS -- The live birth rate among women taking belimumab for systemic lupus erythematosus is similar to the background rate for women with the disorder, a study showed.
But taking into account new research, Pimm and his colleagues refined that background rate to about 0.
The PPTA results are showing us how low the background rate of gravitational waves is," said Dr Bhat.
Home treatment initiation almost tripled the rate of treatment initiation, compared with either the standard of care clusters or the background rate of treatment initiation at local health facilities in an equivalent prior to the study.
Against the given background rate of the retail sale slowed down from 15.
5 levels had been reduced to their natural background rate, the total number of deaths would have fallen by 4,873, or 12 percent.
The current extinction rates of amphibians - which existed even before dinosaurs roamed the Earth - may be more than 200 times the background rate of extinction, the scientists note in this report.
Sadly, the current rate of loss is likely hundreds, possibly thousands of times higher than the natural background rate of 1 species/million/year (Wilson, 2006).
Wilson predicts that the rate of species loss could top 10,000 times the background rate by 2030, and that fully half of the planet's higher life forms could be gone within 100 years.
Scientists have found that current rates of extinction among many species are now many times greater than the natural background rate.
As part of this evaluation the Committee will also consider the so-called background rate for narcolepsy, i.
Mr Ban is due to say that human expansion is wiping out species at about 1,000 times the natural or background rate, and that business as usual is not an option.