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Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
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Psychometric Evaluation of the E-cigarette Dependence Scale.

Meghan E Morean1,2, Suchitra Krishnan-Sarin2, Steve Sussman3

  • 1Department of Psychology, Oberlin College, Oberlin, OH.

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The E-cigarette Dependence Scale (EDS) offers a reliable way to measure e-cigarette addiction. A short, 4-item version is efficient for assessing dependence in adult e-cigarette users.

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Area of Science:

  • Behavioral Science
  • Psychometrics
  • Public Health

Background:

  • Measures for e-cigarette dependence are currently lacking.
  • Existing nicotine dependence scales may not fully capture e-cigarette use patterns.

Purpose of the Study:

  • To adapt and validate the PROMIS Item Bank for Nicotine Dependence for e-cigarette use.
  • To evaluate the psychometric properties of different versions of the E-cigarette Dependence Scale (EDS).

Main Methods:

  • Modified the PROMIS Item Bank v1.0-Smoking: Nicotine Dependence.
  • Administered a survey to 1009 adult e-cigarette users.
  • Conducted psychometric analyses including CFA, internal consistency, and validity tests.

Main Results:

  • All EDS versions demonstrated reliable and valid psychometric properties.
  • Scalar invariance was confirmed across various demographic and usage groups.
  • The 4-item EDS showed comparable efficacy to longer versions for assessing dependence.

Conclusions:

  • The EDS is a psychometrically sound tool for assessing e-cigarette dependence in exclusive and dual users.
  • The 4-item EDS provides an efficient and effective assessment option.
  • The EDS can advance research on e-cigarette use and dependence.