Motl R W, Dishman R K, Trost S G, Saunders R P, Dowda M, Felton G, Ward D S, Pate R R
University of Georgia, Athens, Georgia 30602-6554, USA.
Prev Med. 2000 Nov;31(5):584-94. doi: 10.1006/pmed.2000.0735.
There are few theoretically derived questionnaires of physical activity determinants among youth, and the existing questionnaires have not been subjected to tests of factorial validity and invariance. The present study employed confirmatory factor analysis (CFA) to test the factorial validity and invariance of questionnaires designed to be unidimensional measures of attitudes, subjective norms, perceived behavioral control, and self-efficacy about physical activity.
Adolescent girls in eighth grade from two cohorts (N = 955 and 1,797) completed the questionnaires at baseline; participants from cohort 1 (N = 845) also completed the questionnaires in ninth grade (i.e., 1-year follow-up). Factorial validity and invariance were tested using CFA with full-information maximum likelihood estimation in AMOS 4.0. Initially, baseline data from cohort 1 were employed to test the fit and, when necessary, to modify the unidimensional models. The models were cross-validated using a multigroup analysis of factorial invariance on baseline data from cohorts 1 and 2. The models then were subjected to a longitudinal analysis of factorial invariance using baseline and follow-up data from cohort 1.
The CFAs supported the fit of unidimensional models to the four questionnaires, and the models were cross-validated, as indicated by evidence of multigroup factorial invariance. The models also possessed evidence of longitudinal factorial invariance.
Evidence was provided for the factorial validity and the invariance of the questionnaires designed to be unidimensional measures of attitudes, subjective norms, perceived behavioral control, and self-efficacy about physical activity among adolescent girls.
针对青少年身体活动决定因素的理论推导问卷很少，且现有问卷未经过因子效度和不变性检验。本研究采用验证性因子分析（CFA）来检验旨在作为身体活动态度、主观规范、感知行为控制和自我效能的单维测量问卷的因子效度和不变性。
来自两个队列（N = 955和1797）的八年级少女在基线时完成问卷；队列1的参与者（N = 845）在九年级（即1年随访）时也完成了问卷。使用AMOS 4.0中的全信息最大似然估计进行CFA检验因子效度和不变性。最初，使用队列1的基线数据检验拟合度，并在必要时修改单维模型。使用队列1和队列2基线数据的因子不变性多组分析对模型进行交叉验证。然后使用队列1的基线和随访数据对模型进行因子不变性的纵向分析。
CFA支持单维模型与四份问卷的拟合，并且模型通过多组因子不变性的证据进行了交叉验证。模型还具有纵向因子不变性的证据。
为旨在作为青少年女孩身体活动态度、主观规范、感知行为控制和自我效能的单维测量问卷的因子效度和不变性提供了证据。
