Department of Health Psychology, Freie Universitat Berlin, Germany.
Rehabil Psychol. 2010 Nov;55(4):398-408. doi: 10.1037/a0021563.
For stage-matched interventions, individuals must be classified with respect to their previous behaviors and in conjunction with their future intentions. A novel procedure for the assessment of stages in physical activity was developed. For this, individuals' activity and their regarding intentions were compared with recommended levels of activity. The aim was to examine the psychometric properties.
In a cross-sectional study, stages were assessed in 366 study participants (84 in cardiac and 282 in orthopedic rehabilitation) in terms of their previous physical activity and their intention to perform recommended activity levels in the future.
Stages of change were compared to self-reported behavior, intention, planning, self-efficacy, risk perception, pros, cons, and social support. Misclassification, sensitivity, specificity, receiver operating characteristic (ROC) curves, non-linear trends, and planned contrasts were computed.
In comparison to previous studies, sensitivity (44%-99%) was high and specificity was similar or low (3%-88%), depending on the type of validation outcome selected. When using less demanding criteria (i.e., less intensive activity), measurement quality decreased, although not always significantly. Applying contrast analyses, more than half of the predicted stage differences were confirmed. No main differences between orthopedic and cardiac, ambulant and stationary rehabilitation appeared and no interactions were found.
The stage algorithm proved to have acceptable measurement qualities in study participants recruited in both cardiac and orthopedic rehabilitation. Especially in detecting Intenders and Actors the stage algorithm performed well. Mechanisms of adopting and maintaining recommended activity levels seem to operate equally in both groups.
对于匹配阶段的干预措施，必须根据个体以前的行为并结合他们未来的意图对其进行分类。本文开发了一种评估身体活动阶段的新方法。为此，将个体的活动及其相关意图与推荐的活动水平进行了比较。目的是检验心理测量特性。
在一项横断面研究中，根据 366 名研究参与者（心脏科 84 名，骨科康复科 282 名）以前的身体活动以及他们未来进行推荐活动水平的意图，评估了他们的变化阶段。
将变化阶段与自我报告的行为、意图、计划、自我效能感、风险感知、利弊和社会支持进行了比较。计算了错误分类、敏感性、特异性、接收者操作特征（ROC）曲线、非线性趋势和计划对比。
与以前的研究相比，敏感性（44%-99%）较高，特异性相似或较低（3%-88%），具体取决于所选验证结果的类型。当使用要求较低的标准（即活动强度较低）时，尽管并非总是显著，但测量质量会降低。通过应用对比分析，超过一半的预测阶段差异得到了证实。在骨科和心脏科、门诊和固定康复参与者之间没有发现主要差异，也没有发现交互作用。
该阶段算法在心脏和骨科康复中招募的研究参与者中具有可接受的测量质量。特别是在检测意向者和行动者时，阶段算法表现良好。采用和维持推荐活动水平的机制似乎在两组中同样有效。
