survival curve


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curve

 [kerv]
a line that is not straight, or that describes part of a circle, especially a line representing varying values in a graph.
dose-effect curve (dose-response curve) a graphic representation of the effect caused by an agent (such as a drug or radiation) plotted against the dose, showing the relationship of the effect to changes in the dose.
growth curve the curve obtained by plotting increase in size or numbers against the elapsed time.
oxyhemoglobin dissociation curve a graphic curve representing the normal variation in the amount of oxygen that combines with hemoglobin as a function of the partial pressures of oxygen and carbon dioxide. The curve is said to shift to the right when less than a normal amount of oxygen is taken up by the blood at a given Po2, and to shift to the left when more than a normal amount is taken up. Factors influencing the shape of the curve include changes in the blood pH, Pco2, and temperature; the presence of carbon monoxide; alterations in the constituents of the erythrocytes; and certain disease states.
pulse curve sphygmogram.
Spee curve (curve of Spee) the anatomic curvature of the occlusal alignment of teeth, beginning at the tip of the lower canine, following the buccal cusps of the premolars and molars, and continuing to the anterior border of the ramus.
strength-duration curve a graphic representation of the relationship between the intensity of an electric stimulus at the motor point of a muscle and the length of time it must flow to elicit a minimal contraction; see also chronaxie and rheobase. In cardiac pacing it is useful in determining characteristics of a particular pacing electrode and determining the most efficient selection of pacing parameters for an appropriate safety margin.
survival curve a graph of the probability of survival versus time, commonly used to present the results of clinical trials, e.g., a graph of the fraction of patients surviving (until death, relapse, or some other defined endpoint) at each time after a certain therapeutic procedure.

survival curve

[sərvī′vəl]
Etymology: Fr, survivre, to survive; L, curvus, bent
a plot of the number or percentage of organisms surviving for a given period as a function of radiation dose.

survival curve

Epidemiology A curve that starts at 100% of the study population and shows the percentage of the population still surviving at successive times for as long as information is available. See Survival.

survival curve

In radiobiology, a dose response curve.
See also: curve
References in periodicals archive ?
The medical community uses survival curves to estimate a patient's prognosis by comparing it to the experiences of other patients in like situations who received similar treatment.
For each period, the survival curves of each treatment were estimated in the Kaplan-Meier estimator and compared in the log-rank test (Colosimo & Giolo 2006).
065, Fisher's exact test; Figure 2B), but the survival curve for the antiandrogen was not significantly different from that for control mice (Figure 2C).
Like all medical reporters, I see Kaplan-Meier survival curves for dozens, possibly hundreds of study reports that I cover at medical meetings each year.
Terminal slowing or reversal of the rate of decline, equivalent to the non-Gompertz function characteristic of the survival curve for the population, is unlikely, except perhaps in association with some therapy that dramatically reverses or eliminates a severe illness.
A survival curve generated from survival data also showed "a striking similarity" between the two groups.
As seen in Figure 2, the survival curve for patients with a positive SLN differed significantly (P = 0.
The survival curve of the French population was calculated on the basis of age, sex, and follow-up period and conditional probabilities of death from official published census tables (35).
The delay inherent in transferring such patients to a facility capable of primary percutaneous coronary intervention (PCI) shuts the window of opportunity and moves them into the flatter part of the survival curve.
They cite recent studies of RIT, in which the "tail" of the survival curve indicates that long-term survival without progressive cancer is possible for many patients.
His final score was plotted on the x-axis of a graph against the 2-year Kaplan Meier Survival Curve on the y-axis.

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