A meta-analysis conducted by Binder, Rohling and Larrabee (1997) Binder, L., Rohling, M. and Larrabee, G. 1997. A review of mild head trauma. Part 1: Meta-analytic review of neuropsychological studies.. Journal of Clinical and Experimental Neuropsychology, 19: 421–431. [PUBMED][INFOTRIEVE][CSA][Taylor & Francis Online], [Web of Science ®] , [Google Scholar] established a relationship between mild traumatic brain injury (TBI) and small reductions in cognitive functioning in individuals assessed more than 3 months post-injury. As a follow-up, this study summarized similar research that (1) was published since the previous meta-analysis, and (2) included data collected at any stage post-injury. An extensive literature search revealed 17 suitable studies from which effect sizes were aggregated. The overall effect size was g = 0.32, p < .001. Speed of processing measures had the largest effect, g = 0.47, p < .001. The merging of post-acute effect sizes with those reported in Binder et al.'s review yielded a nonsignificant result, g = 0.11. Time since injury was found to be a significant moderator variable, with effect sizes tending to zero with increasing time post injury.
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FRENCHAM et al. (2005) studied this question.