Background: Weight can be adjusted for height using the Benn parameter (kg/mB), where B is the power that minimises the correlation with height.Aim: To investigate how the Benn parameter changes across age (10-65 years) and time (1956-2015) and differs between sexes.Subjects and methods: The sample comprised 49,717 individuals born in 1946, 1958, 1970 or 2001. Cross-sectional estimates of the Benn parameter were produced and cohort differences at ages 10/11 and 42/43 years were examined using linear regression. Multilevel modelling was used to develop trajectories showing how the Benn parameter changed over age from childhood to mid-adulthood in the three older cohorts.Results: The Benn parameter was closest to 2 in childhood but consistently lower across adulthood, particularly in females and the most recent cohort. At ages 10/11 years, the Benn parameter was greater than 3 in both sexes in the 2001 cohort but between 2.2 and 2.7 in the three older cohorts. This difference was estimated to be +0.67 (0.53, 0.81) in males and +0.53 (0.38, 0.68) in females, compared to the 1946 cohort, and was driven by a much higher weight SD in the 2001 cohort. Conversely, at ages 42/43 years, the Benn parameter was lowest in the 1970 cohort due to a slightly lower weight-height correlation. This difference was estimated to be -0.12 (-0.34, 0.10) in males and -0.15 (-0.42, 0.13) in females, compared to the 1946 cohort.Conclusions: Changes over time in the obesogenic environment appear to have firstly reduced the Benn parameter due to a lowering of the weight-height correlation but secondly and more drastically increased the Benn parameter due to increasing weight variation.

中文翻译：

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根据年龄、性别和出生年份队列，体重与身高关系的差异，以及 BMI 的含义。


背景：可以使用 Benn 参数 (kg/mB) 调整体重以适应身高，其中 B 是最小化与身高相关性的幂。目的：研究 Benn 参数如何随年龄（10-65 岁）和时间（ 1956-2015）并且性别之间存在差异。受试者和方法：样本包括出生于 1946 年、1958 年、1970 年或 2001 年的 49,717 名个体。生成了 Benn 参数的横截面估计值以及 10/11 岁和 42/43 岁的队列差异使用线性回归对年进行了检查。使用多级建模来开发轨迹，显示三个老年群体中 Benn 参数如何随年龄从儿童期到中年期变化。结果：Benn 参数在儿童期最接近 2，但在整个成年期始终较低，特别是在女性和大多数人中。最近的队列。在 10/11 岁时，2001 年队列中男女的 Benn 参数均大于 3，但在 3 个年龄较大的队列中，Benn 参数在 2.2 至 2.7 之间。与 1946 年队列相比，这一差异估计在男性中为 +0.67 (0.53, 0.81)，在女性中为 +0.53 (0.38, 0.68)，并且是由 2001 年队列中更高的体重 SD 驱动的。相反，在 42/43 岁时，由于体重与身高的相关性稍低，Benn 参数在 1970 年队列中最低。与 1946 年的队列相比，男性的这一差异估计为 -0.12 (-0.34, 0.10)，女性的差异为 -0.15 (-0.42, 0.13)。结论：肥胖环境随时间的变化似乎首先降低了 Benn由于体重与身高相关性的降低，Benn 参数增加了，但由于体重变化的增加，Benn 参数大幅增加。