Jo Waller|Remo Ostini|Laura A.V. Marlow|Kirsten McCaffery|Gregory D. Zimet
Validation of a measure of knowledge about human papillomavirus (HPV) using item response theory and classical test theory
University College London|University of Queensland|University College London|University of Sydney|Indiana University – Purdue University Indianapolis
public understanding hpv important ensure informed participation cervical cancer prevention programmes many studies measured hpv knowledge none developed validated measure use across countries aimed develop validate measure items tapping knowledge hpv hpv testing hpv vaccination developed previous literature expert consultation 29item measure administered via internet 2409 adults uk us australia 2011 classical test theory item response theory used establish measures psychometric properties total scale reliability good 0838 internal consistency 16item general hpv knowledge subset 0849 subsets hpv testing vaccination items showed reasonable testretest reliability rtestretest 062 069 moderate internal consistency 052 056 dimensionality analyses suggested one item measuring construct remainder questionnaire 2parameter logistic item response theory irt model fitted remaining 28 scale items structurally coherent set items covering range important hpv knowledge developed responses indicated reliable questionnaire allowed fitting irt model