For 568 boys and 698 girls (ages 8 to 17 years), Neuroticism scores were reliable and factorially valid for both sexes but reliability and validity for Extraversion were modest and, while reliable, 45% of Lie scale items did not load on their factor of origin. Also, Psychoticism scores were unreliable and factorially invalid. Careful item analyses must be undertaken and the construct of psychoticism verified.
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