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Fig. 2 —Theoretic curve showing inverse relationship between predicted
perforation of appendix and patient's age. Logistic regression indicated
following equation for curve: Probability of perforation = 1 / {1 + [exp
(-0.90 + 0.18 x age)]}, where exp is the base of the natural logarithm
(approximately 2.71). The strength of this nonlinear relationship is indicated
by the large test statistic from the model (likelihood ratio test = 63.2;
p < 0.0001).
