However, beginning in 2003, the prevalence of obesity, and thus the average BMI, started to go decrease slightly, according to the Centers for Disease Control and Prevention. ![]() Much of this change appears to have occurred starting in the 1990s, according to the Journal of Adolescent Health study. This is because the average height only increased by 0.3 inches for girls and 0.7 inches for boys, while the average weight increased by over 12 pounds for girls and over 15 pounds for boys. According to an article published in the CDC's publication Advance Data From Vital and Health Statistics in 2004, the average BMI for adolescents between the ages of 12 and 17 increased by more than 4 units between 19. This means that the average BMI for adolescents has been increasing as well. The number of children who are obese has been increasing over the past 40 or so years, according to the Centers for Disease Control and Prevention, but it has recently started to level off. For example, the average BMI for an 18-year-old was 22 in the 1980s, but increased to 24.5 by the year 2000, according to a study published in the Journal of Adolescent Health in 2012. This isn't exactly the same as the current average BMI for adolescents, however, as the data used for these charts dates from 1963 to 1994. BMI is defined as the body mass divided by the square of the body height. Body Mass Index (BMI) is also known as Quetelet Index after Adolphe Quetelet the mathematician who developed the scale. For girls, the range is between 18.7 and 21.3. Synopsis: Calculate the BMI measurement of your child or children using our online Body Mass Index calculator for children aged 1 to 20 years. According to the BMI-for-age charts, the 50th percentile, the midrange for BMIs for a given age, for 13- to 18-year-old boys ranges from about 18.5 to about 22.4.
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