A test-retest reliability study was conducted for the purpose of determining the stability of the performance of 3- and 4-year olds on the Southern California Postrotary Nystagmus Test (SCPNT). The subjects consisted of 28 3-year-olds and 42 4-year-olds enrolled in parent cooperative preschools in metropolitan Seattle, Washington. The two test administrations were planned to occur 5 weeks apart and at approximately the same time of day. The test-re test reliability coefficients for total SCPNT scores for 3-year-olds was .62 and for 4-year-olds was .83. This indicated weak test-re test reliability for 3-year-olds and adequate test-re test reliability for 4-year-olds. Recommendations for the direction of future research were included.
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