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The relationship between the achieved change score on the Western Aphasia Battery (WAB) from baseline to follow-up at 90 days (Achieved ΔWAB) to the maximum possible change score (Potential ΔWAB) for patients receiving therapy, not receiving therapy, and unknown therapy status, respectively. The 95% confidence intervals are displayed above and below. The equation for the curve is y = 1.11x + 1.6834.
