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. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: J Am Acad Child Adolesc Psychiatry. 2009 Jan;48(1):42–50. doi: 10.1097/CHI.0b013e31818b1c4e

Figure 1.

Figure 1

Item Characteristic Curves for Conduct Disorder items

Figure 1 shows the item characteristic curves (ICCs) for each of the CD symptoms. On the x-axis, the severity of CD is scaled to have a mean of 0 and a standard deviation of 1 in males. The severity parameter for an item can be determined by identifying the point on the x-axis where the probability of endorsement (y-axis) is 50% (indicated by a dashed line). For example, the severity parameter for “Steal no Confrontation” is 0.24. The ICCs also depict the discrimination parameters of items; ICCs with steeper slopes have higher discrimination parameters.