Table 2.

Frequency of significant improvement.

Group	%C	IRT-P(S)	MPT-P(S)	MPT-E(D)
Control group	0	3	0	0
	0%	13%	0%	0%
Treatment Group 1	4	6	5	8**
	11%	16%	13%	21%
Treatment Group 2	6**	5	5*	5*
	18%	15%	15%	15%
Treatment Groups 1 + 2	10*	11	10*	13**
	14%	15%	14%	18%

Note. Treatment versus control frequency. %C = percent correct; IRT = item response theory; MPT = multinomial processing tree.

^* p < .1.

^** p < .05.