Datar Ashlesha, Chung Paul J
Center for Economic and Social Research, University of Southern California, Los Angeles, Calif; RAND Health, The RAND Corporation, Santa Monica, Calif.
Departments of Pediatrics and Health Policy and Management, University of California, Los Angeles, Calif; Children's Discovery & Innovation Institute, Mattel Children's Hospital UCLA, Los Angeles, Calif; RAND Health, The RAND Corporation, Santa Monica, Calif.
Acad Pediatr. 2016 Apr;16(3):267-74. doi: 10.1016/j.acap.2015.06.003. Epub 2015 Jul 22.
To describe the accuracy of weight perceptions in a nationally representative sample of US 8th graders, its relationship with weight control intentions (WCI), and the relationship of weight misperceptions and WCI with diet and activity behaviors.
Data analyzed came from the 8th grade wave (2006-2007) of the Early Childhood Longitudinal Study-Kindergarten Class, a nationally representative sample. Body mass index was calculated from height and weight measurements for 7800 8th graders (mean age 14.3 years). Measured weight status was categorized into underweight, normal weight, overweight, and obese using the US Centers for Disease Control and Prevention's age- and sex-specific growth charts. Self-reported weight status was compared with measured weight status to classify adolescents into accurate perceivers, overestimators, and underestimators. Multivariate logistic and negative binomial regression models were estimated for binary and count data outcome variables, respectively.
Overall, 42.1% of adolescents misperceived their weight status: 35.3% underestimated and 6.8% overestimated their weight status. Among overweight or obese adolescents, 68.4% misperceived their weight status; 35% of underweight adolescents overestimated their weight status. Among normal-weight adolescents, 8.5% overestimated and 18.5% underestimated their weight. Compared to accurate perception, both overestimation and underestimation of weight status were associated with greater likelihood of inappropriate WCI, but only underestimation was associated with unhealthy diet and activity behaviors.
Weight misperception was a common problem among US adolescents from all weight categories and was associated with inappropriate WCI. Future research should examine how adolescents' weight perceptions are formed and whether reducing misperceptions may improve behaviors.
描述美国八年级学生全国代表性样本中体重认知的准确性、其与体重控制意图（WCI）的关系，以及体重认知错误和WCI与饮食及活动行为的关系。
分析的数据来自幼儿纵向研究——幼儿园班级的八年级调查（2006 - 2007年），这是一个全国代表性样本。根据7800名八年级学生（平均年龄14.3岁）的身高和体重测量值计算体重指数。使用美国疾病控制与预防中心的年龄和性别特异性生长图表，将测量的体重状况分为体重过轻、正常体重、超重和肥胖。将自我报告的体重状况与测量的体重状况进行比较，以将青少年分为准确感知者、高估者和低估者。分别针对二元和计数数据结果变量估计多元逻辑回归和负二项回归模型。
总体而言，42.1%的青少年错误感知了自己的体重状况：35.3%低估了自己的体重状况，6.8%高估了自己的体重状况。在超重或肥胖青少年中，68.4%错误感知了自己的体重状况；35%的体重过轻青少年高估了自己的体重状况。在正常体重青少年中，8.5%高估了体重，18.5%低估了体重。与准确感知相比，体重状况的高估和低估都与不适当的WCI可能性增加有关，但只有低估与不健康的饮食和活动行为有关。
体重认知错误是美国所有体重类别的青少年中普遍存在的问题，并且与不适当的WCI有关。未来的研究应探讨青少年的体重认知是如何形成的，以及减少认知错误是否可以改善行为。
