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A score comparability study for the NBDHE: paper-pencil versus computer versions.

Tsung-Hsun Tsai1, Chingwei David Shin

  • 1Department of Testing Services, American Dental Association, Chicago, IL 60611, USA. tsait@ada.org

Evaluation & the Health Professions
|May 26, 2012
PubMed
Summary

The National Board Dental Hygiene Examination

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Area of Science:

  • Dental hygiene education
  • Health professions examination

Background:

  • The National Board Dental Hygiene Examination (NBDHE) is a standardized assessment.
  • Transitioning from paper-pencil (PP) to computer-based (CB) testing requires validation.

Purpose of the Study:

  • To evaluate the comparability of the PP NBDHE with two CB versions.
  • To assess validity and psychometric criteria for NBDHE test forms.

Main Methods:

  • Analysis of data from 4,560 candidates who took the PP NBDHE in Spring 2009.
  • Comparison with data from 973 and 1,033 candidates who took two separate CB NBDHE versions in 2009.
  • Inclusion of survey data from 2,486 candidates who took the CB versions.

Main Results:

Keywords:
NBDHERasch IRT modelbeta-binomial modelcomparabilityfactor analytic approachvalidity

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  • The paper-pencil and computer-based versions of the NBDHE demonstrated comparability.
  • Psychometric criteria indicated consistency between PP and CB test formats.
  • Validity evidence supported the equivalence of the different NBDHE versions.

    • Conclusions:

    • Computer-based versions of the NBDHE are comparable to the traditional paper-pencil format.
    • The transition to computer-based testing for dental hygiene licensure is psychometrically sound.
    • The NBDHE maintains its validity and reliability across different administration modes.