Subject's concentration score for correctly repeating the number 4-9-3 in reverse order, as part of Military Acute Concussion Evaluation (MACE and MACE2).

Kay, S., Wolkenfeld, F., and Murrill, L. (1988). Profiles of aggression among psychiatric patients. I. Nature and prevalence. J Nerv Ment Dis 176(9), 539-546. Yudofsky, S., Silver, J., Jackson, W., Endicott, J., and Williams, D. (1986). The Overt Aggression Scale for the objective rating of verbal and physical aggression. Am J Psychiatry 143(1), 35-39.

Go to next string length if correct on first trial. Stop if incorrect on both trials. Concentration: Inform the patient: IM GOING TO READ YOU A STRING OF NUMBERS AND WHEN I AM FINISHED, REPEAT THEM BACK TO ME BACKWARDS, THAT IS, IN REVERSE ORDER OF HOW I READ THEM TO YOU. FOR EXAMPLE, IF I SAY 7-1-9, YOU WOULD SAY 9-1-7. If the patient is correct on the first trial of each string length, proceed to the next string length. If incorrect, administer the 2nd trial of the same string length. Proceed to the next string length if correct on the second trial. Discontinue after failure on both trials of the same string length. Total of 4 different string lengths; 1 point for each string length for a total of 4 points. NOW TELL ME THE MONTHS IN REVERSE ORDER, THAT IS, START WITH DECEMBER AND END IN JANUARY. 1 point if able to recite ALL months in reverse order. 0 points if not able to recite ALL of them in reverse order. Total possible score for concentration portion: 5.

Reverse Digits