Watson Kathy, Baranowski Tom, Thompson Debbe, Jago Russell, Baranowski Janice, Klesges Lisa M
Department of Pediatrics, Children's Nutrition Research Center, Baylor College of Medicine, 1100 Bates Street, Houston, TX 77030, USA.
Health Educ Res. 2006 Dec;21 Suppl 1:i85-97. doi: 10.1093/her/cyl137. Epub 2006 Nov 3.
This study examined multidimensional item response theory (MIRT) modeling to assess social desirability (SocD) influences on self-reported physical activity self-efficacy (PASE) and fruit and vegetable self-efficacy (FVSE). The observed sample included 473 Houston-area adolescent males (10-14 years). SocD (nine items), PASE (19 items) and FVSE (21 items) were measured with previously validated self-report instruments containing Likert-type responses. Physical activity was objectively measured using the Computer Science Application Incorporated/Manufacturing Technology Incorporated (CSA/MTI) accelerometer. Total fruit, juice and vegetable consumption was measured with a food frequency questionnaire. Correlations between self-efficacy and behaviors were minimal, regardless of controlling for SocD. However, in a simulated sample derived to demonstrate the utility of MIRT when relationships exist, the pseudo-relationships between self-efficacy and behaviors were substantially weaker after controlling for SocD. MIRT provided disattenuated correlations between SocD and self-efficacy, thereby providing more precise estimates of the real influence of SocD on the relationship between self-efficacy and behavior. However, as shown in the observed sample, more research is needed to understand the influence of SocD on the relationship between self-efficacy and behaviors for different populations and for different degrees of SocD response bias.
本研究考察了多维项目反应理论（MIRT）模型，以评估社会期望（SocD）对自我报告的身体活动自我效能感（PASE）和水果与蔬菜自我效能感（FVSE）的影响。观察样本包括473名休斯顿地区的青少年男性（10 - 14岁）。使用包含李克特型反应的先前验证过的自我报告工具测量SocD（9个项目）、PASE（19个项目）和FVSE（21个项目）。使用计算机科学应用公司/制造技术公司（CSA/MTI）加速度计客观测量身体活动。用食物频率问卷测量水果、果汁和蔬菜的总消费量。无论是否控制SocD，自我效能感与行为之间的相关性都很小。然而，在为证明存在关系时MIRT的效用而推导的模拟样本中，控制SocD后，自我效能感与行为之间的伪关系显著减弱。MIRT提供了SocD与自我效能感之间的去衰减相关性，从而更精确地估计了SocD对自我效能感与行为之间关系的实际影响。然而，如观察样本所示，需要更多研究来了解SocD对不同人群以及不同程度的SocD反应偏差下自我效能感与行为之间关系的影响。
