Lin Shengjie, Falbo Toni
Center for Emotional Intelligence, Child Study Center, Yale School of Medicine, Yale University, New Haven, Connecticut, USA.
Population Research Center, The University of Texas at Austin, Austin, Texas, USA.
Pediatr Obes. 2022 Jul;17(7):e12899. doi: 10.1111/ijpo.12899. Epub 2022 Feb 10.
To examine if sibling absence is associated with higher BMI and to identify potential lifestyle factors underlying this effect; to determine if sibling effects on BMI persist into adulthood.
We used data from all five waves of the National Longitudinal Study of Adolescent to Adult Health to study the sibling factors and BMI of 3,563 participants who were in grades 7-12 at first wave (1994-95). These participants were measured again in the second wave (1996), the third wave (2001-2002), the fourth wave (2008-2009), and most recently, the fifth wave (2016-2018). We identified categories of siblings, comparing the BMI of those without siblings either to birth order or sibship size. BMI was calculated based on direct measurements of height and weight; underlying mechanisms were self-reported.
Participants without siblings had significantly higher BMI than those with siblings, across waves, regardless of sibship size. Those without siblings had consistently higher BMI than middle-born, but not last-born participants. Adolescents without siblings reported eating fast food more frequently and spending more screen time.
Sibling absence is associated with higher BMI in adolescence and this difference persists into adulthood.
研究没有兄弟姐妹是否与更高的体重指数（BMI）相关，并确定造成这种影响的潜在生活方式因素；确定兄弟姐妹对BMI的影响是否会持续到成年期。
我们使用了《青少年到成人健康国家纵向研究》全部五轮的数据，来研究3563名在第一轮（1994 - 1995年）处于7 - 12年级的参与者的兄弟姐妹因素和BMI。这些参与者在第二轮（1996年）、第三轮（2001 - 2002年）、第四轮（2008 - 2009年）以及最近的第五轮（2016 - 2018年）再次接受测量。我们确定了兄弟姐妹的类别，将没有兄弟姐妹者的BMI与出生顺序或同胞数量进行比较。BMI是根据身高和体重的直接测量值计算得出的；潜在机制通过自我报告获得。
在所有轮次中，没有兄弟姐妹的参与者的BMI显著高于有兄弟姐妹的参与者，无论同胞数量如何。没有兄弟姐妹的参与者的BMI始终高于出生顺序在中间的参与者，但不高于最后出生的参与者。没有兄弟姐妹的青少年报告说更频繁地吃快餐，花在屏幕前的时间更多。
没有兄弟姐妹与青少年时期较高的BMI相关，且这种差异会持续到成年期。
