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Development and psychometric testing of the self-regulatory questionnaire for lung cancer screening (SRQ-LCS)

Research output: Contribution to journalArticlepeer-review

Samantha Quaife, Katherine Brain, Claire Stevens, Claudia Kurtidu, Sam Janes, Jo Waller

Original languageEnglish
Pages (from-to)1-17
JournalPsychology and Health
DOIs
Published17 Feb 2021

Bibliographical note

Funding Information: SLQ, KEB, CS, CK and JW declare no conflicts of interest. SMJ is supported by funding from a commercial US healthcare company (GRAIL Inc.) as part of funding for a large trial of low dose CT screening, called the ‘SUMMIT Study’. SLQ collaborates on the SUMMIT Study. SMJ has been paid by Astra Zeneca, BARD1 Bioscience and Achilles Therapeutics for being an Advisory Board Expert and for travel to one US conference. SMJ receives grant funding from Owlstone for a separate research study. All authors perceive that these disclosures pose no academic conflict for this study. All authors declare no other relationships or activities that could appear to have influenced the submitted work. Publisher Copyright: © 2021 The Author(s). Published with license by Taylor & Francis Group, LLC. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

King's Authors

Abstract

Background: Research implicates psychological factors in low uptake of lung cancer screening. We developed and psychometrically tested a standardised measure of these psychological determinants in preparation for a prospective, longitudinal cohort study of screening uptake. Methods: Leventhal’s Common-Sense Model of Self-Regulation of Health and Illness provided the theoretical framework to generate the initial item pool. Items were refined during expert review and cognitive interviews which tested for face validity, redundancy, acceptability and comprehensibility. An online survey piloted the refined pool with 1500 current and former (quit ≤ 15 years) smokers aged 55–80. The response distributions, internal reliability and factor structure determined the final retained constructs. Regression analyses examined these constructs’ associations with screening intention, smoking status and demographics. Results: The final measure included seven factor-derived subscales (consequences, personal control, treatment control, illness coherence, emotional representation, behavioural response and appraisal, risk perception) with Cronbach’s alphas ranging from 0.59 to 0.91 and four single-item questions (response efficacy for smoking cessation, treatment intention, perceived stigma and lung cancer survival). Most constructs were associated with smoking status and screening intention (p’s <.05). Conclusions: The Self-Regulatory Questionnaire for Lung Cancer Screening (SRQ-LCS) is an acceptable, reliable and valid measure for investigating the psychological determinants of screening uptake.

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