A new caretaker questionnaire for assessment of NYLS temperament characteristics in one-to-three-year-olds, part of a series of such instruments, is described. A study of stability of individual differences from early infancy to one-to-three years found significant correlations on all dimensions. Maternal general impressions, however, changed in several ways in the intervening time.
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McDevitt et al. (1981) studied this question.
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