Scatter plot with quadratic fit of association between duration of rehabilitation and progress in motor FIM during rehabilitation. Notes: Correlation is moderate and statistically significant (Spearman’s<br>ρ = 0.508; P < 0.001). Quadratic fit, which is superimposed, is statistically significantly better than linear fit (P < 0.001; adjusted<br>R2 = 0.36 vs. 0.14). Dashed lines show 95% confidence interval for the fit
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