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Related Concept Videos

Applications of Normal Distribution01:22

Applications of Normal Distribution

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The normal distribution is a useful statistical tool. One of its practical applications is determining the door height after considering the normal distribution of heights of persons, such that many can pass through it easily without striking their heads. The normal distribution can also determine the probability of a person having a height less than a specific height.
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Variation: Normal Distribution, Range, and Standard Deviation02:32

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In the field of psychology, there are several ways to organize measurements of a trait, feature, or characteristic (i.e., variables). Qualitative data, such as ethnicity, can be tabulated into a frequency count to provide information about the proportion, as well as the variety of groups in a sample or population. On the other hand, researchers can perform a wider set of calculations on quantitative data. The mean, mode, and median, for instance, are central tendency measures to identify a...
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Drug Dosing: Infants and Children01:29

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Pediatric patient dosages diverge from adults due to disparities in body surface area, total body water, and extracellular fluid per kilogram of body weight. The dosing regimen considers the variations in pharmacokinetics and pharmacology across distinct age groups, encompassing preterm newborns, infants, young children, older children, and adolescents. Calculation of pediatric patient doses is predicated on determining body surface area, which exhibits a superior correlation with the child's...
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The Ratio of X Chromosome to Autosomes02:45

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In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
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Pharmacokinetics in Pediatric Patients: Drug Distribution01:17

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Drug distribution in the pediatric population exhibits unique challenges and considerations due to the physiological differences between children, particularly neonates and infants, and adults. A crucial aspect of pediatric pharmacology is understanding how these differences impact the pharmacokinetics of various drugs, necessitating age-specific dosing strategies to ensure efficacy and safety.Neonates and infants have a higher total body water content, ~75%–90% of their body weight,...
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Midrange01:07

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A somewhat easy to compute quantitative estimate of a data set’s central tendency is its midrange, which is defined as the mean of the minimum and maximum values of an ordered data set.
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Related Experiment Video

Updated: Dec 17, 2025

Anogenital Distance and Perineal Measurements of the Pelvic Organ Prolapse POP Quantification System
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Anogenital Distance and Perineal Measurements of the Pelvic Organ Prolapse POP Quantification System

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Anogenital Distance in Healthy Infants: Method-, Age- and Sex-related Reference Ranges.

Margit Bistrup Fischer1,2, Marie Lindhardt Ljubicic1,2, Casper P Hagen1,2

  • 1Deptartment of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.

The Journal of Clinical Endocrinology and Metabolism
|June 24, 2020
PubMed
Summary
This summary is machine-generated.

Anogenital distance (AGD) reference ranges were established for infants, showing AGD increases up to six months. These findings aid clinical evaluation of prenatal androgen action and epidemiological research.

Keywords:
anogenital distancedisorders of sexual developmentendocrine disrupting chemicalsreference ranges

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Area of Science:

  • Pediatric endocrinology
  • Human anatomy
  • Public health

Background:

  • Anogenital distance (AGD) is increasingly used in clinical and epidemiological studies.
  • There is a scarcity of sex-specific reference data and longitudinal data on AGD in children.

Purpose of the Study:

  • To establish age-, sex-, and method-related reference ranges for AGD in healthy children aged 0-24 months.
  • To assess age-related changes in AGD.
  • To evaluate two common AGD measurement methods.

Main Methods:

  • Compiled data from 3705 healthy children (0-24 months) across 4 international centers.
  • Collected 7295 AGD measurements, including ano-scrotal, ano-penile, and ano-clitoral distances.
  • Analyzed AGD in relation to body size indices (BMI, length, etc.) and assessed measurement reproducibility.

Main Results:

  • Age-specific reference ranges for AGD were created.
  • AGD increased from birth to 6 months, then plateaued.
  • AGD/BMI changes were minor in the first year (0-6% in boys, 0-11% in girls).

Conclusions:

  • Established AGD reference ranges are valuable for epidemiological research and clinical evaluation of prenatal androgen action.
  • AGD increase in the first year is age-related, while AGD/BMI remains stable.
  • The TIDES and Cambridge measurement methods demonstrated equal reproducibility.