Schapira Marilyn M, Walker Cindy M, Miller Tamara, Fletcher Kathlyn E, Ganschow Pamela S, Jacobs Elizabeth A, Imbert Diana, O'Connell Maria, Neuner Joan M
a Department of Medicine, Perelman School of Medicine , University of Pennsylvania , Philadelphia , Pennsylvania , USA.
J Health Commun. 2014;19 Suppl 2(0 2):240-53. doi: 10.1080/10810730.2014.933916.
Health numeracy can be defined as the ability to understand and use numeric information and quantitative concepts in the context of health. The authors previously reported the development of the Numeracy Understanding in Medicine Instrument (NUMi), a 20-item test developed using item response theory. The authors now report the development and validation of a short form of the NUMi. Item statistics were used to identify a subset of 8 items representing a range of difficulty and content areas. Internal reliability was evaluated with Cronbach's alpha. Divergent and convergent validity was assessed by comparing scores of the S-NUMI with existing measures of education, print and numeric health literacy, mathematic achievement, cognitive reasoning, and the original NUMi. The 8-item scale had adequate reliability (α=.72) and was strongly correlated to the 20-item NUMi (α=.92). S-NUMi scores were strongly correlated with the Lipkus Expanded Health Numeracy Scale (α=.62), the Wide Range of Achievement Test-Mathematics (α=.72), and the Wonderlic Cognitive Ability Test (α=.76). Moderate correlation was found with education level (α=.58) and print literacy as measured by the Test of Functional Health Literacy in Adults (α=.49). Results show that the short form of the NUMi is a reliable and valid measure of health numeracy feasible for use in clinical and research settings.
健康数字素养可定义为在健康背景下理解和运用数字信息及定量概念的能力。作者之前报告了医学数字素养理解工具（NUMi）的开发情况，这是一项采用项目反应理论开发的包含20个条目的测试。作者现在报告NUMi简版的开发与验证情况。利用项目统计数据来确定一个由8个条目组成的子集，这些条目代表了一系列难度和内容领域。使用克朗巴哈系数评估内部信度。通过比较简版NUMi（S-NUMI）与教育、印刷和数字健康素养、数学成绩、认知推理以及原始NUMi的现有测量指标的得分，来评估区分效度和聚合效度。这个8条目量表具有足够的信度（α = 0.72），并且与20条目NUMi（α = 0.92）高度相关。S-NUMi得分与利普库斯扩展健康数字素养量表（α = 0.62）、广泛成就测试 - 数学（α = 0.72）以及旺德利克认知能力测试（α = 0.76）高度相关。发现与教育水平（α = 0.58）以及由成人功能性健康素养测试所测量的印刷素养（α = 0.49）存在中度相关性。结果表明，NUMi简版是一种可靠且有效的健康数字素养测量工具，适用于临床和研究环境。
