title: Responsiveness of a Brief Measure of Lung Cancer Screening Knowledge.
abstract: Our aim was to examine the responsiveness of a lung cancer screening brief knowledge measure (LCS-12). Eligible participants were aged 55-80 years, current smokers or had quit within 15 years, and English speaking. They completed a baseline pretest survey, viewed a lung cancer screening video-based patient decision aid, and then filled out a follow-up posttest survey. We performed a paired samples t-test, calculated effect size, and calculated absolute and relative percent improvement for each item. Participants (n = 30) were primarily White (63%) with less than a college degree (63%), and half were female (50%). Mean age was 61.5 years (standard deviation [SD] = 4.67) and average smoking history was 30.4 pack-years (range = 4.6-90.0). Mean score on the 12-item measure increased from 47.3% correct on the pretest to 80.3% correct on the posttest (mean pretest score = 5.67 vs. mean posttest score = 9.63; mean score difference = 3.97, SD = 2.87, 95% CI = 2.90, 5.04). Total knowledge scores improved significantly and were responsive to the decision aid intervention (paired samples t-test = 7.57, p < .001; Cohen's effect size = 1.59; standard response mean [SRM] = 1.38). All individual items were responsive, yet two items had lower absolute responsiveness than the others (item 8: "Without screening, is lung cancer often found at a later stage when cure is less likely?" pretest correct = 83.3% vs. posttest = 96.7%, responsiveness = 13.4%; and item 10: "Can a CT scan find lung disease that is not cancer?" pretest correct = 80.0% vs. posttest = 93.3%, responsiveness = 13.3%). The LCS-12 knowledge measure may be a useful outcome measure of shared decision making for lung cancer screening.
authors.affiliation: Department of Health Services Research, Division of Cancer Prevention and Population Sciences, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd Unit 1444, Houston, TX, 77030, USA.
authors.forename: Ashley J
authors.initials: AJ
authors.lastname: Housten
authors.affiliation: Department of Health Services Research, Division of Cancer Prevention and Population Sciences, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd Unit 1444, Houston, TX, 77030, USA.
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Lowenstein
authors.affiliation: Department of Health Services Research, Division of Cancer Prevention and Population Sciences, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd Unit 1444, Houston, TX, 77030, USA.
authors.forename: Viola B
authors.initials: VB
authors.lastname: Leal
authors.affiliation: Department of Health Services Research, Division of Cancer Prevention and Population Sciences, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd Unit 1444, Houston, TX, 77030, USA. bvolk@mdanderson.org.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Volk
mesh_terms: D003657:Decision Making; D003661:Decision Support Techniques; D055088:Early Detection of Cancer / Q000523:psychology* / Q000706:statistics & numerical data*; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis* / Q000523:psychology; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011795:Surveys and Questionnaires
keywords: Knowledge measure; Lung cancer screening; Shared decision making; Smoking