Department of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA.
Am J Health Promot. 2010 Nov-Dec;25(2):e11-20. doi: 10.4278/ajhp.090914-QUAN-296.
Examine the construct validity of a modified stages-of-change (SOC) scale among adults with physical disabilities by investigating the relations among the transtheoretical model (TTM) constructs, physical activity (PA), and SOC. Additionally, the SOC algorithm was compared with previously recommended SOC scales.
DESIGN/SETTING: Cross-sectional online survey.
271 adults with physical disabilities (x(age) = 49.25; 73.4% females).
Standardized questionnaires for the TTM constructs and PA. ANALYSES/RESULTS: Based on the multivariate analysis of variance, the hypothesized relations between the SOC and the TTM constructs were supported. According to the analysis of variance, PA levels increased almost linearly across the SOC. Precontemplators (x = 8.53 metabolic equivalent [MET]-h/d) had lower PA scores than contemplators (x = 14.27 MET-h/d) and preparators (x = 17.64 MET-h/d), who in turn had lower scores than those in action (x = 23.03 MET-h/d). Based on the direct discriminant function analysis, all TTM constructs were important predictors of the SOC (e.g., r = .85 for behavioral processes; r = .69 for self-efficacy; and r = .58 for cognitive processes). The most accurately predicted SOC were action (76.9%), precontemplation (70.6%), contemplation (44.6%), and preparation (14.9%), with an overall classification accuracy of 56.8%. The study participants were more evenly distributed across the SOC algorithm compared with previous studies.
The construct validity of the SOC scale was supported. The scale differentiated almost linearly the levels of PA and most TTM constructs, and participants were well-represented across SOC. Health promoters should feel confident in using the proposed SOC scale and the TTM to implement stage-matched PA motivational programs.
通过研究跨理论模型（TTM）构念、身体活动（PA）与阶段变化（SOC）之间的关系，检验一种改良的 SOC 量表在身体残疾成年人中的构念效度。此外，还比较了 SOC 算法与先前推荐的 SOC 量表。
设计/设置：横断面在线调查。
271 名身体残疾成年人（x（年龄）= 49.25；73.4%为女性）。
TTM 构念和 PA 的标准化问卷。
分析/结果：基于多变量方差分析，SOC 与 TTM 构念之间的假设关系得到支持。根据方差分析，SOC 水平几乎呈线性增加。前沉思者（x = 8.53 代谢当量 [MET]-h/d）的 PA 得分低于沉思者（x = 14.27 MET-h/d）和准备者（x = 17.64 MET-h/d），而后者的得分又低于行动者（x = 23.03 MET-h/d）。根据直接判别函数分析，所有 TTM 构念都是 SOC 的重要预测因子（例如，行为过程的 r =.85；自我效能的 r =.69；认知过程的 r =.58）。SOC 预测最准确的是行动（76.9%）、前沉思（70.6%）、沉思（44.6%）和准备（14.9%），整体分类准确率为 56.8%。与以往研究相比，研究参与者在 SOC 算法中的分布更加均匀。
SOC 量表的构念效度得到支持。该量表几乎线性区分 PA 水平和大多数 TTM 构念，参与者在 SOC 中分布广泛。健康促进者在实施基于阶段匹配的 PA 动机计划时，可以对所提出的 SOC 量表和 TTM 充满信心。
