To the Editor: The study by Palmer et al. in the March 31 issue* is interesting because, as the authors stated, physical therapy is used routinely in patients with cerebral palsy, without solid evidence of its efficacy. The strengths of the study include strict enrollment and measurement criteria, which minimized confounding variables as well as false positive errors. In addition, the physical therapy was given by the same therapist to minimize interobserver differences, and measurements were taken by investigators blinded to group assignments to minimize bias further. Most important, the study was designed as a randomized, controlled experiment. A major.
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