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The Middle Childhood Temperament Questionnaire is a 99-item parent questionnaire for assessing the New York Longitudinal Study temperament traits in 8− to 12-year-old children. The nine characteristics measured are the same except that biological rhythmicity has been replaced by predictability. The scale was standardized on 506 children in a pediatric practice and a school district. Internal consistency and retest reliability are satisfactory, respectively 0.81 and 0.88 for median category values. Together with the Infant Temperament Questionnaire, the Toddler Temperament Scale, and the Behavioral Style Questionnaire this completes a series of scales for gathering more objective and organized temperament data from 4 months to 12 years.