So you think you're bulletproof: Development and validation of the Invincibility Belief Index (IBI)

William D.S. Killgore, Amanda Kelley, Thomas J. Balkin

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Risk-taking propensity can be infl uenced by sensation-seeking traits and self-perceived invincibility. We hypothesized that the latter factor may refl ect a stable trait that endures across situations and may infl uence risk-taking behavior. We developed and validated a 20-item scale, the Invincibility Belief Index (IBI) to measure this construct. The IBI demonstrated good internal consistency and excellent test-retest reliability in the development sample ( n = 100) and sustained similar levels of reliability in a cross-validation sample ( n = 74). Principal components analysis yielded three orthogonal factors measuring self-perceived impunity (immunity from consequences), boldness/audacity (self-assuredness and competitiveness), and adroitness (mental agility and survival skill). In the prediction of risk taking, IBI scores contributed additional unique variance beyond sensation-seeking scores alone. IBI scores demonstrated convergent and discriminant validity with concurrently administered measures. These preliminary results support the reliability and validity of the IBI as a brief measure of self-perceived vulnerability- invincibility in the face of adversity.

Original languageEnglish (US)
Pages (from-to)499-508
Number of pages10
JournalMilitary Medicine
Volume175
Issue number7
DOIs
StatePublished - Jul 2010
Externally publishedYes

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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