Nilsson M H, Hagell P, Iwarsson S
Department of Health Sciences, Lund University, Lund, Sweden.
The PRO-CARE Group, School of Health and Society, Kristianstad University, Kristianstad, Sweden.
Acta Neurol Scand. 2015 Aug;132(2):89-96. doi: 10.1111/ane.12368. Epub 2015 Jan 28.
This study aimed to investigate the psychometric properties of the General Self-Efficacy Scale (GSE) in people with Parkinson's disease (PD). More specifically, we investigated data completeness, scaling assumptions, targeting, reliability, and construct validity.
This study involves data available from two different projects that included people diagnosed with PD for at least 1 year, yielding two samples (1 and 2). The combined total sample (N=346; 60% men) had a mean (SD) age and PD duration of 71 (8.9) and 9 years (6.3), respectively. Both samples received a self-administered survey by mail, which was administered twice in sample 2. Additional data (e.g., clinical assessments) were available for Sample 1.
Total GSE scores were computable for 336 participants (97%). Corrected item-total correlations exceeded 0.4. Principal component analyses identified one component (the eigenvalue of the first component extracted was 6.9), explaining 69% of the total variance. Floor and ceiling effects were <6%. Internal consistency (coefficient alpha) was 0.95. Analyses of test-retest reliability yielded (ICC) values from 0.69 to 0.80. The highest value refers to those (n=47) with identical self-ratings of mobility (in the on condition) at both tests; the standard error of measurement was 3.1 points. Construct validity was further supported by correlations in accordance with a priori expectations.
This study provides support for the validity and reliability of GSE scores in people with PD; the GSE can thus serve as a valuable outcome measurement in clinical practice and research.
本研究旨在调查帕金森病（PD）患者中一般自我效能感量表（GSE）的心理测量特性。更具体地说，我们调查了数据完整性、量表假设、针对性、信度和结构效度。
本研究涉及来自两个不同项目的数据，这些项目纳入了诊断为PD至少1年的患者，产生了两个样本（样本1和样本2）。合并后的总样本（N = 346；60%为男性）的平均（标准差）年龄和PD病程分别为71（8.9）岁和9年（6.3）。两个样本均通过邮件接受了自我管理的调查，样本2进行了两次调查。样本1可获得额外数据（如临床评估）。
336名参与者（97%）的GSE总分可计算。校正后的项目-总分相关性超过0.4。主成分分析确定了一个成分（提取的第一个成分的特征值为6.9），解释了总方差的69%。地板效应和天花板效应均<6%。内部一致性（α系数）为0.95。重测信度分析得出的组内相关系数（ICC）值在0.69至0.80之间。最高值指的是在两次测试中对运动能力（在开期状态下）自我评分相同的47人；测量标准误为3.1分。结构效度得到了与先验预期一致的相关性的进一步支持。
本研究为PD患者中GSE评分的有效性和可靠性提供了支持；因此，GSE可作为临床实践和研究中有价值的结局指标。
