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. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: Early Hum Dev. 2013 Jul 12;89(10):781–786. doi: 10.1016/j.earlhumdev.2013.06.004

Fig. 1. Probability of CP diagnosis by 3 years of age based on decrease in DAYC motor scores between the 6 and 12-month visits.

Fig. 1

DAYC score is the motor score for corrected age; shaded area indicates 95% confidence interval. The C-index for this model is C = 0.89, which is highly significant (p < 0.001). The C-index is a statistic that measures the predictive accuracy of a model; it measures the probability that the predicted outcome is the same as the observed outcome. The C-index is equal to the area under the explain ROC (ROC) curve and takes on values between 0 and 1, with a value of 0.5 indicating no predictive accuracy, and a value of 1.0 being a perfect predictor.