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We investigated the effectiveness of neurodevelopmental treatment when used both in isolation and in combination with other developmental therapies. The data were analyzed using recently developed methods of quantitatively synthesizing research results in which the literature review process is regarded as a unique type of research. Our analysis revealed that the subjects who received NDT performed slightly better than the control-comparison subjects who did not receive the intervention. The study outcomes are discussed in relation to several design variables and study characteristics associated with subject performance. The advantages and limitations of quantitative reviewing are identified briefly, and the potential use of the procedures in clinical research is emphasized.
Ottenbacher et al. (1986) studied this question.