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Of pregnancies among girls aged 15–19 girls in 2008, 59% ended in birth, 26% in abortion, and the rest in miscarriage. [17] Overall, 68 pregnancies occurred per 1,000 girls aged 15–19 in 2008. Nearly 7% of 15–19-year-old girls become pregnant each year.
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
In the United States, the mean age at first marriage is about 32 for men and about 30.8 for women, putting the average age at first marriage at about 31.4 for both genders. However, in India, it is even lower, at about 30 for men and about 27.2 for women, putting the average age at first marriage at about 28.6 for both genders. [citation needed]
The average age at which puberty begins may be affected by ethnicity as well. For example, the average age of menarche in various populations surveyed has ranged from 12 [58] [59] [60] to 18 years. The earliest average onset of puberty is for African-American females and the latest average onset for high altitude subsistence populations in Asia.
In 2014, 249,078 babies were born to girls 15 to 19 years of age, corresponding to a birth rate of 24.2 per 1,000 girls. [12] In 2016, three in ten American girls fell pregnant before age 20, corresponding to almost 750,000 pregnancies a year. [14] In 2008, 16% of all girls became teen mothers. [15]
The average body weight of women in America has been steadily increasing over the past few decades. According to national surveys, about 42 percent of U.S. women have obesity and an additional 27 ...
Sex ratio by country for the population below age 15. Blue represents more boys, red more girls than the world average of 1.07 males/female. Sex ratio by country for total population. Blue represents more men and boys, red more women and girls than the world average of 1.01 males/female. Sex ratio by country for the over-65 population.
Due to natural variation, individuals pass through the Tanner stages at different rates, depending in particular on the timing of puberty.Among researchers who study puberty, the Tanner scale is commonly considered the "gold standard" for assessing pubertal status when it is conducted by a trained medical examiner. [5]