College of Public Health, University of Iowa, 5233 Westlawn, Iowa City, IA, 52242, USA.
College of Nursing, University of Iowa, Iowa City, IA, USA.
Osteoporos Int. 2017 Dec;28(12):3379-3388. doi: 10.1007/s00198-017-4204-z. Epub 2017 Sep 7.
We studied the Osteoporosis and You knowledge scale in 7749 participants enrolled in a clinical trial. Results confirmed its psychometric properties in a diverse audience. Baseline scores were associated with better recall of bone mineral density test results at follow-up; however, the scale was not responsive to knowledge change.
The goal of this study was to confirm the measurement properties of the Osteoporosis and You (O&Y) knowledge scale using classic test theory methods in the 7749 men and women participating in the Patient Activation After DXA Result Notification (PAADRN) randomized controlled trial. We hypothesized a simple factor structure that would reflect the four-factor model previously published.
We conducted psychometric analyses which included item analysis, internal consistency reliability, construct validity using exploratory and confirmatory factor analysis (EFA and CFA), comparing knowledge levels across pre-specified groups, and responsiveness to change.
PAADRN participants were predominantly college educated, White females with low bone density, and a moderate level of 10-year fracture risk. EFA revealed four domains closely matching those in two previous reports. While overall scale reliability was minimally acceptable at 0.68, the reliabilities of the domain subscales were unacceptably low (0.59, 0.64, 0.45, and 0.36 for the Biological, Lifestyle, Consequences, and Prevention and Treatment subscales). CFA revealed the data fit the hypothesized model reasonably well with the items loading on their expected latent variable. The scale was not responsive to change, but although not significant, improved knowledge indicated better DXA result recall at 12 and 52 weeks.
In the PAADRN population, the O&Y knowledge scale had psychometric properties similar to those previously reported. Over 12 and 52 weeks, participants did not demonstrate significant changes in knowledge, but those with higher knowledge at baseline were more likely to accurately recall their baseline DXA result.
我们在一项临床试验中对 7749 名参与者进行了骨质疏松症与你知识量表的研究。结果证实了该量表在不同人群中的心理测量特性。基线评分与随访时骨密度测试结果的更好回忆相关；然而，该量表对知识变化没有反应。
本研究的目的是使用经典测试理论方法，在参与患者骨密度检测结果通知后激活（PAADRN）随机对照试验的 7749 名男性和女性中，确认骨质疏松症与你（O&Y）知识量表的测量特性。我们假设一个简单的因素结构，该结构将反映先前发表的四因素模型。
我们进行了心理测量分析，包括项目分析、内部一致性可靠性、使用探索性和验证性因素分析（EFA 和 CFA）的结构有效性，比较预定义组之间的知识水平，以及对变化的反应。
PAADRN 参与者主要受过大学教育，是白人女性，骨密度低，10 年骨折风险处于中等水平。EFA 显示出四个与之前两份报告密切匹配的领域。尽管整体量表的可靠性仅可接受（0.68），但各领域子量表的可靠性却不可接受（0.59、0.64、0.45 和 0.36 分别为生物学、生活方式、后果和预防与治疗子量表）。CFA 显示数据与假设模型拟合得相当好，项目加载到其预期的潜在变量上。该量表对变化没有反应，但尽管不显著，知识的提高表明在 12 周和 52 周时对 DXA 结果的回忆更好。
在 PAADRN 人群中，O&Y 知识量表具有与之前报告相似的心理测量特性。在 12 周和 52 周时，参与者的知识没有显著变化，但基线知识较高的参与者更有可能准确回忆他们的基线 DXA 结果。
