Fig. 3. Working memory testing summary. Mean number of trials to criteria (TTC), averaged over posthemodilution days 18-24. Results are plotted by group. The mean numbers of TTC for platform locations 2-10 were as follows: YSh (4.6 ± 1.7), YAn (4.9 ± 1.7, P = 0.86), ASh (5.8 ± 2.3, P < .05, *), and AAn (8.0 ± 4.0, P < 0.001, ***). Significance is expressed in relationship to YSh performance. AAn = aged anemic; ASh = aged sham; YAn = young anemic; YSh = young sham.