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首页> 外文期刊>European journal of clinical nutrition >Body mass index in children and adolescents according to age and pubertal stage.
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Body mass index in children and adolescents according to age and pubertal stage.

机译：根据年龄和青春期分的儿童和青少年体重指数。

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OBJECTIVE: To evaluate the dependence of body mass index (BMI) values on pubertal stage in subjects similar in age. DESIGN, SUBJECTS AND MEASUREMENTS: Height and weight were recorded cross-sectionally in school subjects from three provinces in central Italy. The subjects were subdivided into three groups: (1) 4271 school subjects (2125 males and 2146 females; 8.5-15.5 y old), in whom the pubertal development was also recorded, were selected to subdivide BMI values according to pubertal stage and age; (2) 6345 females (10.5-14.5 y old), who were asked whether or not they had had their first menstrual period, were selected to subdivide BMI values according to age in pre-menarche and post-menarche girls, separately; and (3) 1919 females (10.5-14.5 y old), who had presented their menarche within the previous 6 months, were selected to subdivide short-term post-menarche BMI values according to age. RESULTS: The medians and interquartile ranges of BMI varied according to age and pubertal stage. Kruskall-Wallis test performed in subjects similar in age demonstrated that significant differences existed among the medians of BMI values of subjects at different pubertal stages in 12-14-y-old males (P<0.05), and in 11-14-y- old females (P<0.001). The difference also proved to be significant between stage I and stage II (P<0.05) in 10-y-old females, but not in 10-11-y-old males. The Kruskal-Wallis test performed in subjects similar in pubertal stage demonstrated that significant differences among the medians of BMI at different ages existed only in females at stages II and III. A significant positive trend was observed in both genders according to pubertal stage for BMI values of subjects similar in age (z-test for trend, P<0.01). On the contrary, a negative age trend proved to be significant in females at stages I (P<0.01), II (P<0.01) and III (P<0.001), but not in males when the subdivision of BMI was made according to age in subjects similar in pubertal stage. BMI values were significantly higher in post-menarche girls as compared to pre-menarche girls similar in age (P<0.001). However, at partial regression analysis BMI values were influenced by pubertal stage and, to a lesser extent, by age, but not by menarcheal status. An inverse association between short-term post-menarche BMI and age was observed, with the highest values in girls presenting menarche at 11 y of age (P<0.05). The negative trend was demonstrated at the z-test for trend (P<0.001). CONCLUSIONS: BMI values depend on pubertal degree of maturation, especially in girls. This influence should be taken into account when BMI is evaluated in adolescents. Sponsor: University of Perugia, Region of Umbria.
机译：目的：评估年龄相似的受试者的体重指数（BMI）值对青春期的依赖性。设计，主题和测量：身高和体重横断记录在意大利中部三个省的学校科目中。将受试者分为三组：（1）选择4271名学校受试者（男性2125名，女性2146名; 8.5-15.5岁），其中还记录了青春期发育，根据青春期和年龄将其BMI值细分; （2）选择6345名女性（10.5-14.5岁），询问他们是否有初次月经期，根据初潮前和初潮后女孩的年龄分别对BMI值进行细分; （3）1919名女性（10.5-14.5岁）在过去6个月内表现出初潮，并根据年龄细分了初潮后短期BMI值。结果：BMI的中位数和四分位数范围随年龄和青春期的不同而变化。在年龄相似的受试者中进行的Kruskall-Wallis测试表明，在12-14岁的男性和11-14岁的男性中，处于不同青春期的受试者的BMI值中位数之间存在显着差异（P <0.05）老年女性（P <0.001）。在10岁的女性中，I期和II期之间的差异也很明显（P <0.05），而在10-11-岁的男性中则没有。在青春期相似的受试者中进行的Kruskal-Wallis测试表明，不同年龄的BMI中位数之间的显着差异仅在II和III期女性中存在。青春期阶段，年龄相似的受试者的BMI值在两个性别中均观察到显着的积极趋势（趋势z检验，P <0.01）。相反，在第一阶段（P <0.01），第二阶段（P <0.01）和第三阶段（P <0.001），女性的负年龄趋势被证明是显着的，而按照BMI细分时，男性的年龄趋势却不明显。与青春期相似的受试者年龄。与年龄相似的初潮前女孩相比，初潮后女孩的BMI值显着更高（P <0.001）。但是，在部分回归分析中，BMI值受青春期的影响，并且受年龄的影响较小，但受初潮状态的影响较小。初潮后短期BMI与年龄之间呈负相关，在初潮时11岁的女孩中BMI最高（P <0.05）。在趋势的z检验中显示出负趋势（P <0.001）。结论：BMI值取决于青春期的成熟程度，尤其是女孩。在青少年中评估BMI时应考虑到这种影响。赞助商：翁布里亚地区佩鲁贾大学。

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