Of 52 children who attended a sports camp for children with visual impairments, 15 demonstrated stereotypic rocking currently or in the past. Three factors were associated with rocking: etiology of visual impairment, visual status, and early medical history. Children who were the most likely to exhibit rocking were those with retinopathy of prematurity who underwent lengthy hospital stays and multiple surgeries early in their lives and who were totally blind from birth.
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McHugh et al. (2003) studied this question.
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