risk ratio

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 [ra´she-o] (L.)
an expression of the quantity of one substance or entity in relation to that of another; the relationship between two quantities expressed as the quotient of one divided by the other.
A/D ratio adult versus developmental toxicity ratio; the ratio between the toxic effects of a substance on adults (humans or animals, especially pregnant females) and such effects on developing embryos or fetuses.
A-G ratio (albumin-globulin ratio) the ratio of albumin to globulin in blood serum, plasma, cerebrospinal fluid, or urine.
arm ratio a figure expressing the relation of the length of the longer arm of a mitotic chromosome to that of the shorter arm.
benefit-risk ratio a determination of the potential of a research study for positive effects on patients compared to the risks of doing harm.
cardiothoracic ratio on a chest radiograph, the ratio of the transverse diameter of the heart to the internal diameter of the chest at its widest point just above the dome of the diaphragm.
grid ratio a ratio comparing the height of lead lines in an x-ray grid to the distance between the lead strips.
inspiratory-expiratory ratio the ratio of the inspiratory time to the expiratory time during the breathing cycle. Normally, expiratory time will be longer than inspiratory time; if the inspiratory time is longer than the expiratory time, gas trapping may result.
lecithin/sphingomyelin ratio see lecithin-sphingomyelin ratio.
risk ratio relative risk.
sex ratio the proportion of one sex to the other; by tradition the number of males in a population to the number of females, usually stated as the number of males per 100 females.
signal-to-noise ratio the ratio between the amplitude of a signal being measured and that of the noise.
urea excretion ratio the ratio of the amount of urea in the urine excreted in one hour to the amount in 100 ml of blood. The normal ratio is 50.
zeta sedimentation ratio (ZSR) a measurement comparable to the erythrocyte sedimentation rate, except that it is unaffected by anemia. The packed-cell volume (zetacrit) of a blood specimens is calculated by centrifuging the specimen in a Zetafuge, a specially designed instrument that produces controlled cycles of compaction and dispersion and allows rouleaux to form and sediment rapidly. The zetacrit divided into the true hematocrit gives the zeta sedimentation ratio.

risk ratio



The probability of the occurrence of a disease in a group that has been exposed to some environmental, medicinal, microbial, or toxic influence, relative to its probability in a randomly selected population.


the chance of an unfavorable event occurring.

acceptable risk
risk for which the benefits rank larger than the potential hazards.
at risk
that part of a total population which is subject to the disease being reviewed, e.g. only milking cows are at risk to milk fever, only grazing cows to enzootic nasal granuloma.
risk aversion
reluctance to take risks.
risk factor
an attribute or exposure which increases the probability of occurrence of a disease or other outcome.
risk premium
the amount of money required to convince a person to take a specific risk.
risk ratio
the ratio of two risks.
relative risk
see relative risk.
specified risk materials
a term used in the US to denote tissues that can be infected with the agent of bovine spongiform encephalopathy (BSE), namely brain and spinal cord, spinal ganglia, retina, and terminal small intestine. Banned from inclusion in any feed stuff.
surgical risk
an animal that has poor general health and must be assessed as a poor survival risk to undergo major surgery or anesthesia.
References in periodicals archive ?
In these sites the rate before opening was higher than for all sites, but the standardized risk ratios after opening were very similar to the overall risk ratios.
Effect of Contraceptive Use on Bacterial Vaginosis Risk Contraception Method Number of Patients Adjusted Risk Ratio None (reference) 1,786 1.
DTT] risk ratios remained positive in all models, and these point estimates were generally higher than point estimates for the other pollutant included; however, most lag 0-2 [OP.
Note that the relative risk is also called the risk ratio in the literature, [6] but for convenience we use the term 'relative risk' hereafter.
Overall, the estimated risk ratio for disabled individuals was 1.
Comparing the highest with the lowest quintiles of dietary fiber intake, adjusted predicted marginal risk ratios (95% confidence interval) for the metabolic syndrome, in and obesity were 0.
Obesity significantly increased the risk for SSI in all surgical groups except for abdominal hysterectomy, with risk ratios ranging from 1.
Penile swabs were tested for HPV anda model was used to estimate adjusted incidence rate ratios and clearance risk ratios.
May 1 (Reuters) - Radian Group Inc posted a second straight quarterly loss, hurt by the change in value of derivatives and other financial instruments, but the mortgage insurer said its risk ratios improved in the quarter.
If this occurred TC/HDL risk ratios were not calculated for those subjects and the comparisons between the different analysis methods were not performed.
Consistent with recommendations from the field, this study defined the acceptable range of risk ratios as values between 0.