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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Thus, fact probabilities alone--whether risk ratios, correlations, regression results, or other statistical estimates--may not be considered without an accompanying measure of the belief probability.
Major Finding: Obesity significantly increased the risk for surgical site infection in all surgical groups except for abdominal hysterectomy, with risk ratios ranging from 1.62 for knee replacement to 1.87 for large bowel surgery.
However, assessment of multiple subgroup variables showed that age modified the treatment effect; no difference was seen in the estimated 120-day risk of stroke or death in those under age 70 years who underwent stenting versus endarterectomy (5.8% and 5.7%, respectively; risk ratio 1.00), but the risk of stroke or death was doubled in those aged 70 years or older who underwent stenting versus endarterectomy (12.0% vs.
The number of deaths for MRSA and MSSA infections was estimated as follows: the clinical panel estimated a risk ratio for death rates of MRSA and MSSA infections, and deaths due to MRSA and MSSA infections were calculated from the estimated risk ratio and the overall number of deaths due to S.
Attack rate (%) Food Ate Did not eat Risk ratio (95% Cl(*)) Ham 65.4 2.4 26.8 (3.8-189.6) Chicken 30.0 25.5 1.2 (0.5- 2.7) Turkey 38.9 22.4 1.7 (0.8- 3.8) Rice pilaf 15.4 29.6 0.5 (0.1 - 2.0) Rolls 47.1 20.0 1.4t (0.8- 2.3) Eggs 34.8 22.7 1.5 (0.7- 3.3) Salad platter 31.3 25.5 1.2 (0.5- 2.9) Nuts 25.0 27.1 0.9 (0.3- 3.3) Cake 23.5 28.0 0.8 (0.3- 2.2) Cookies 11.8 32.0 0.4 (0.1 - 1.4) Punch 18.4 37.9 0.5 (0.2- 1.1)
The risk ratio favored intensive BP control when the data from this trial were pooled with the results from three previous relevant randomized controlled trials (relative risk, 0.78; 95 percent confidence interval, 0.64 to 0.96; P = 0.02).
219/11 621; risk ratio (RR) 1.09, 95% confidence interval (CI) 0.91 - 1.31).
(1) Women who opted for labor induction without any medical indication were more likely than those who delivered spontaneously to require drugs to manage postpartum hemorrhage (relative risk ratio, 1.5), be admitted to the intensive care unit (2.9), need anesthesia or pain-relieving medications and procedures during labor (1.6-3.7) and delay the initiation of breast-feeding (1.1-3.1).
The risk ratio for death from prostate cancer was 1.16 (95% confidence interval 0.78-1.73).
However, there was only a small short-term decrease in risk ratio in patients taking statins and the development of osteoarthritis.
In the meta-analysis of the studies, the risk ratio was calculated as eradication rate/noneradication rate.