Test of memory malingering: cutoff scores for psychometrically defined malingering groups in a military sample

This research examined cutoffs for the Test of Memory Malingering (TOMM) in a military sample composed primarily of mTBI patients. The results are consistent with previous research and provide additional evidence that cutoffs higher than those originally recommended for the TOMM can produce excellent classification and diagnostic statistics when a psychometrically defined non-malingering group is compared with three psychometrically defined malingering groups: Probable, Probable to Definite, and Definite Malingering. The groups were formed based on the number of symptom and performance validity tests passed or failed. Cutoffs that were 4-5 points higher for Trial 2 and the Retention Trial than originally recommended produced very low false positive rates (.0 to .06) and excellent positive predictive values (.75 to 1.00) for a base rate of malingering commonly found in TBI patients. Positive likelihood ratios were all above 10 for these two trials indicating excellent ability to rule in malingering. A range of cutoffs for Trial 1 were also examined, and classification and diagnostic statistics are presented for cutoffs ranging from 40 to 44 with results similar to the other TOMM trials.