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Figure 1. Median and mean quartile of fluid intelligence quotient (IQ) pre- and postoperation with assessment of the significance between and within both groups. Significance between groups—TA1: p = 0.03;* TA2: p = 0.01;* TA3: p = 0.003.† Significance within groups—play group: p = 0.04;* control group: p = 0.74. *Significance set at p = 0.05. †Significance set at p = 0.01. TA1 = time point of assessment 1 day preoperation, TA2 = time point of assessment 2 days postoperation, TA3 = time point of assessment 9 days postoperation. Brem MH, Lehrl S, Rein AK, Massute S, Schulz-Drost S, Gelse K, Schlechtweg PM, Hennig FF, Olk A, Jacob HJ, Gusinde J. Stop of loss of cognitive performance during rehabilitation after total hip arthroplasty—Prospective con-trolled study. J Rehabil Res Dev. 2010;47(9):891–98. DOI:10.1682/JRRD.2010.01.0011