The 3 adjustment scores of the California Test of Personality and the Anxiety and Neuroticism scores of the IPAT Children's Personality Questionnaire served as dependent variables in statistical analyses of data from 144 elementary school children in one sample and 238 in another. No main effects of birth order or family size were obtained and interactions involving these variables were few. It was concluded that though the effects of family constellation factors are limited and variable, a continuing research focus on them is justified because of the low ratio of costs to benefits when they do yield valid predictions.
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