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相关概念视频

Signs of Puberty01:27

Signs of Puberty

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Puberty is a critical phase, typically beginning between the ages of 8 and 13 in girls and 9 and 14 in boys, though timing can vary based on genetics, environmental factors, and overall health. This period is characterized by the development of secondary sexual characteristics and the attainment of reproductive potential. Endocrine changes underpin puberty, with hormonal surges of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) instigated by Gonadotropin-Releasing Hormone (GnRH)...
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Polygenic Traits01:18

Polygenic Traits

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When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
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z Scores and Area Under the Curve01:17

z Scores and Area Under the Curve

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z scores are the standardized values obtained after converting a normal distribution into a standard normal distribution. A z score is measured in units of the standard deviation. The z score tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a z score of...
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Introduction to z Scores01:05

Introduction to z Scores

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A z score (or standardized value) is measured in units of the standard deviation. It indicates how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
z scores...
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Introduction to z Scores01:06

Introduction to z Scores

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A z score (or standardized value) is measured in units of the standard deviation. It tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
z scores...
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Nature and Nurture01:10

Nature and Nurture

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Many human characteristics, like height, are shaped by both nature—in other words, by our genes—and by nurture, or our environment. For example, chronic stress during childhood inhibits the production of growth hormones and consequently reduces bone growth and height. Scientists estimate that 70-90% of variation in height is due to genetic differences among individuals, and 10-30% of variation in height is due to differences in the environments that individuals experience,...
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相关实验视频

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Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts
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身体质量指数z-Score与青春期之间的纵向关联:结构方程建模分析.

Luísa Harumi Matsuo1, Gilciane Ceolin2, Francisco de Assis Guedes de Vasconcelos1

  • 1Postgraduate Program in Nutrition, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.

American journal of human biology : the official journal of the Human Biology Council
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概括

在女孩中,更高的童年体重指数 (BMI) 与更早的青春期 (月经期) 有关. 在男孩中,饮食和社会经济地位影响了青春期的时间. 需要进一步的研究.

关键词:
青少年 青少年 青少年 青少年身体质量指数 (BMI) 是指身体质量指数.第一个是初潮 (menarche).超重的人超重.青春期的青春期,就是青春期.学校的孩子们 学生性成熟性成熟性的成熟.

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科学领域:

  • 儿科内分泌学 儿科内分泌学
  • 公共卫生 公共卫生
  • 营养科学 营养科学

背景情况:

  • 青春期时间的变化可能表明人口健康的转变.
  • 越来越多的超重和肥胖患病率是一个公共卫生问题.

研究的目的:

  • 纵向分析儿童体重指数 (BMI) 与巴西学生青春期发育之间的关联.
  • 为了调查BMI对性成熟 (SM) 五年后的影响.

主要方法:

  • 对494名学生 (2007年7-10岁) 的纵向研究.
  • 计算BMIz-score;使用坦纳阶段进行青春期发展自我评估.
  • 使用结构方程建模,根据社会经济地位 (SES),出生体重,母乳养,体力活动和饮食模式 (DP) 进行调整.

主要成果:

  • 在两性中,BMI和MS之间没有显著的关联.
  • 在女孩中,更高的童年BMIz-score与更早的初潮年龄直接相关.
  • 超加工食品的消费通过女孩的BMI间接影响初潮时的年龄.

结论:

  • 儿童BMI与女孩早期初潮有关.
  • 饮食模式和SES影响男孩的青春期时间.
  • 性别特定的研究对于了解不同人群中早期青春期的决定因素至关重要.