Perception & Psychophysics

, Volume 45, Issue 5, pp 381–384

Internal consistency reliability of the fractionated and whole University of Pennsylvania Smell Identification Test

  • Richard L. Doty
  • Richard E. Frye
  • Udayan Agrawal
Article

DOI: 10.3758/BF03210709

Cite this article as:
Doty, R.L., Frye, R.E. & Agrawal, U. Perception & Psychophysics (1989) 45: 381. doi:10.3758/BF03210709

Abstract

The internal consistency reliability (ICR) of the 40-item University of Pennsylvania Smell Identification Test (UPSIT) and its 10-, 20-, and 30-item fractions was explored, as well as the relationships between the fractions and the entire 40-item test. Pearson correlation coefficients (rs) were computed among all independent combinations and permutations of the four 10-item UPSIT booklets using data from 774 subjects. The median r values of the 10- and 20-item combinations were used to establish the ICRs of the 10- and 20-item tests. The ICRs of the 30- and 40-item tests were estimated using the Spearman-Brown formula and the medianrs of the 20-item combinations. Additional ICR estimates of the 40-item UPSIT were obtained from nonsymmetrical fractions using the Horst formula. The ICRs for the UPSIT and its 10-, 20-, and 30-item fractions were 0.922, 0.752, 0.855 and 0.898, respectively. No major sex differences emerged. Estimates of correlations between (1) single booklets and two-booklet combinations and (2) the 40-item UPSIT using Guilford’s (1953) correction for nonindependence ranged from 0.812 to 0.871. Overall, these results indicate that (1) the UPSIT and its 10-, 20-, and 30-item fragments have very high ICRs and (2) individual UPSIT booklets or their combinations can be used to assess smell function in a reliable manner where extreme time constraints are present (e.g., in surveys and in brief neuropsychological test batteries).

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Copyright information

© Psychonomic Society, Inc. 1989

Authors and Affiliations

  • Richard L. Doty
    • 1
  • Richard E. Frye
    • 1
  • Udayan Agrawal
    • 1
  1. 1.Smell and Taste CenterHospital of the University of PennsylvaniaPhiladelphia