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A study used data from 1,000 kindergartners, 1,000 third graders, 1,000 sixth graders and confirmatory factor analyses were conducted for the two-factor and one-factor model to determine which fit the data better. The findings indicate that the structure of Torrance Tests of Creative Thinking (TTCT) scores is consistent with a two-factor theory and model parameters for gender groups are more invariant than for grade levels in determining the fit of the model.