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Change in strategy by ferritin response group; change (endpoint-baseline) in Spatial Working Memory strategy score for six- and eight-box problems in ferritin responders (n = 17) and non-responders (n = 26). A lower score and larger negative change indicate better strategy. Main effect of responder group, p = 0.007; * p < 0.05 between-group comparison for eight-box problem.
