Wilson Kathryn E, Harden Samantha M, Almeida Fabio A, You Wen, Hill Jennie L, Goessl Cody, Estabrooks Paul A
Department of Human Nutrition, Foods, and Exercise, Virginia Tech.
Department of Agriculture and Applied Economics, Virginia Tech.
Psychol Assess. 2016 Oct;28(10):1255-1264. doi: 10.1037/pas0000249. Epub 2015 Nov 30.
Self-efficacy is a commonly included cognitive variable in weight-loss trials, but there is little uniformity in its measurement. Weight-loss trials frequently focus on physical activity (PA) and eating behavior, as well as weight loss, but no survey is available that offers reliable measurement of self-efficacy as it relates to each of these targeted outcomes. The purpose of this study was to test the psychometric properties of brief, pragmatic self-efficacy scales specific to PA, healthful eating and weight-loss (4 items each). An adult sample (n = 1,790) from 28 worksites enrolled in a worksite weight-loss program completed the self-efficacy scales, as well as measures of PA, dietary fat intake, and weight, at baseline, 6-, and 12-months. Confirmatory factor analysis supported the hypothesized factor structure indicating, 3 latent self-efficacy factors, specific to PA, healthful eating, and weight-loss. Measurement equivalence/invariance between relevant demographic groups, and over time was also supported. Parallel growth processes in self-efficacy factors and outcomes (PA, fat intake, and weight) support the predictive validity of score interpretations. Overall, this initial series of psychometric analyses supports the interpretation that scores on these scales reflect self-efficacy for PA, healthful eating, and weight-loss. The use of this instrument in large-scale weight-loss trials is encouraged. (PsycINFO Database Record
自我效能感是减肥试验中常见的认知变量，但在其测量方面几乎没有一致性。减肥试验通常关注身体活动（PA）、饮食行为以及体重减轻，但尚无一项调查能够提供与这些目标结果相关的可靠的自我效能感测量方法。本研究的目的是测试针对PA、健康饮食和减肥的简短、实用的自我效能感量表（各4项）的心理测量特性。来自28个工作场所的1790名成年人样本参加了一项工作场所减肥计划，他们在基线、6个月和12个月时完成了自我效能感量表，以及PA、膳食脂肪摄入量和体重的测量。验证性因素分析支持了假设的因素结构，表明存在3个潜在的自我效能感因素，分别针对PA、健康饮食和减肥。相关人口群体之间以及随时间的测量等效性/不变性也得到了支持。自我效能感因素与结果（PA、脂肪摄入量和体重）之间的平行增长过程支持了分数解释的预测效度。总体而言，这一系列初步的心理测量分析支持这样一种解释，即这些量表上的分数反映了PA、健康饮食和减肥方面的自我效能感。鼓励在大规模减肥试验中使用该工具。（PsycINFO数据库记录）
