TY - JOUR
T1 - Longitudinal comparison of alternate versions of the symbol digit modalities test
T2 - Issues of form comparability and moderating demographic variables
AU - Uchiyama, C. L.
AU - D'Elia, L. F.
AU - Dellinger, A. M.
AU - Selnes, O. A.
AU - Becker, J. T.
AU - Wesch, J. E.
AU - Chen, B. B.
AU - Satz, P.
AU - Van Gorp, W.
AU - Miller, E. N.
N1 - Funding Information:
Craig Lyons Uchiyama',2, Louis F. D'Elia3, Ann M. Dellinger4, Ola A. Selnes6, James T. Beckers, Jerry E. Wesch7, Bai Bai Chen6, Paul Satz3, Wilfred van Gorp3, and Eric N. Miller3 For the Multicenter AIDS Cohort Study* ' UCSF Langley Porter Psychiatric Institute 2UCSF Center on Deafness 3UCLA School of Medicine 4UCLA School of Public Health sUniversity of Pittsburgh Graduate School of Public Health and School of Medicine "Johns Hopkins University School of Hygiene and Public Health 'Howard Brown Memorial Clinic-Northwestern University Medical School * The Multicenter AIDS Cohort Study includes the following investigators: Baltimore-The Johns Hopkins University School of Hygiene and Public Health: Alfred J. Saah, Principal Investigator; John Palenicek, Haroutune Armenian, Homayoon Farzadegan, Neil Graham, Joseph Margolick, Justin C. McArthur, Ola A. Selnes. Chicago-Howard Brown Memorial Clinic - Northwestern University Medical School: John P. Phair, Principal Investigator; Joan S. Chmiel, Kenneth Bauer, Bruce A. Cohen, Daina Variakojis, Jerry Wesch, Steven M. Wolinsky. Los Angles-University of California, UCLA Schools of Public Health and Medicine and the Jonsson Comprehensive Cancer Center, Los Angeles: Roger Detels, Principal Investigator; Barbara R. Visscher, Jan Dudley, Irvin Chen, John L. Fahey, Janis V. Giorgi, Shelia Jin, Andrew Leuchter, Oto Martinez-Maza, Eric N. Miller, Hal Morgenstern, Pari Nishanian, Marc Nuwer, Paul Satz, Elyse Singer, Jeremy Taylor, Wilfred van Gorp, Jerry Zack. Pittsburgh-University of Pittsburgh Graduate School of Public Health and School of Medicine: Charles R. Rinaldo, Jr., Principal Investigator; Lawrence Kingsley, James T. Becker, Mary Amanda Dew, Phalguni Gupta, Monto Ho, Lili Penkower. Data Coordinating Center-The Johns Hopkins School of Hygiene and Public Health: Alvaro MuRoz, Principal Investigator; Helena Bacellar, Noya Galai, Leonard0 Epstein, Donald R. Hoover, Lisa P. Jacobson, Jill Kirby, Curtis Meinert, Kenrad Nelson, Steven Piantadosi, Sol Su. National lnstitutes oftiealth-National Institute of Allergy and Infectious Disease: Lewis Schrager, Project Officer; Sten H. Vermund, Richard A. Kaslow, Mark J. VanRaden; National Cancer Institute: Iris Obrams, Daniela Seminara. Supported by National Institutes of Health contracts NO1 A1 72631, A1 72634, A1 32535, A1 72676, and A1 72632. Requests for reprints should be sent to: Craig Lyons Uchiyama, Ph.D., UCSF, Langley Porter Psychiatric Institute; 401 Parnassus Box CPT; San Francisco, CA 94143-0984 U.S.A.
PY - 1994
Y1 - 1994
N2 - A longitudinal examination of the comparability of two alternate versions of the Symbol Digit Modalities Test (SDMT) was undertaken on a large (N = 3,509), multiregional, healthy male sample. Significant differences were noted between the test scores of the two forms, both upon initial and longitudinal administration, with higher test scores generally being associated with the original version, and higher recall scores being associated with the alternate version. Due to these differences, it is recommended that comparisons between the forms be made only with standardized scores based on test-specific norms, such as those provided in the present study. It was determined that no significant practice effects were noted over the 2-year retest period, demonstrating the relatively stability of the two versions across time. Finally, the demographic characteristics of age, and estimated IQ were demonstrated to be significantly associated with test performance, emphasizing the importance of the stratification of normative data by these variables in interpreting SDMT performance.
AB - A longitudinal examination of the comparability of two alternate versions of the Symbol Digit Modalities Test (SDMT) was undertaken on a large (N = 3,509), multiregional, healthy male sample. Significant differences were noted between the test scores of the two forms, both upon initial and longitudinal administration, with higher test scores generally being associated with the original version, and higher recall scores being associated with the alternate version. Due to these differences, it is recommended that comparisons between the forms be made only with standardized scores based on test-specific norms, such as those provided in the present study. It was determined that no significant practice effects were noted over the 2-year retest period, demonstrating the relatively stability of the two versions across time. Finally, the demographic characteristics of age, and estimated IQ were demonstrated to be significantly associated with test performance, emphasizing the importance of the stratification of normative data by these variables in interpreting SDMT performance.
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U2 - 10.1080/13854049408401558
DO - 10.1080/13854049408401558
M3 - Article
AN - SCOPUS:0028279758
SN - 0920-1637
VL - 8
SP - 209
EP - 218
JO - Clinical Neuropsychologist
JF - Clinical Neuropsychologist
IS - 2
ER -