ItemCharacteristics RefId AssessmentItemRefId AssessmentFormRefId PercentCorrect SampleSize SampleDescription Measurements Measurement MeasurementCode MeasurementDescription ScaleValue Min Max Optimal Descriptive PValue SampleSize PointBiserial Biserial DiscriminationIndex DifferentialItemAnalysis CMH MH ResponseChoicePattern Choice ChoiceLabel Responses SIF_Metadata SIF_ExtendedElements