Predicted discharge cognition, motor, and total functional status ratings by diagnosis-specific volume quintiles. The values were obtained from hierarchical linear models and represent the predicted FIM ratings for white, female patients with average clinical characteristics (age, comorbidity burden, duration to admission, admission functional status, and length of stay) within each of the three diagnosis categories. Sample sizes increase across quintiles and vary by diagnosis: stroke 12,867 (Q1) – 83,567 (Q5), fracture 5,609 (Q1) – 59,511 (Q5), joint replacement 4,326 (Q1) – 79,831 (Q5), see Table for more details. Reference category = Q3 for all tests of significance. Underlined value labels indicate significant (p < .01) difference compared to Q3.