Industrialized and developing countries have distinctly different rates of teenage pregnancy. In developed regions, such as North America and Western Europe, teen parents tend to be unmarried and adolescent pregnancy is seen as a social issue.
By contrast, teenage parents in developing countries are often married, and their pregnancy may be welcomed by family and society. However, in these societies, early pregnancy may combine with malnutrition and poor health care to cause medical problems. A report by Save the Children found that, annually, 13 million children are born to women under age 20 worldwide. More than 90% of these births occur to women living in developing countries. Complications of pregnancy and childbirth are the leading cause of mortality among women between the ages of 15 and 19 in such areas, as they are the leading cause of mortality among older women.
The age of the mother is determined by the easily verified date when the pregnancy ends, not by the estimated date of conception. Consequently, the statistics do not include women who became pregnant at least shortly before their 20th birthdays, but whose pregnancies ended on or after their 20th birthdays.
The teenage birth rate in United States was 53 births per 1,000 women aged 15–19 in 2002, the highest in the developed world. If all pregnancies, including those that end in abortion or miscarriage, are taken into account, the total rate in 2000 was 75.4 pregnancies per 1,000 girls. Nevada and the District of Columbia have the highest teen pregnancy rates in the U.S., while North Dakota has the lowest. Over 80% of teenage pregnancies in the U.S. are unintended; approximately one third end in abortion, one third end in spontaneous miscarriage, and one third will continue their pregnancy and keep their baby.
However, the trend is decreasing: in 1990, the birth rate was 61.8, and the pregnancy rate 116.9 per thousand. This decline has manifested across all racial groups, although teenagers of African-American and Hispanic descent retain a higher rate, in comparison to that of European-Americans and Asian-Americans. The Guttmacher Institute attributed about 25% of the decline to abstinence and 75% to the effective use of contraceptives.
Within the United States teen pregnancy is often brought up in political discourse. The goal to limit teen pregnancy is shared by Republicans and Democrats, though avenues of reduction are usually different. Many Democrats cite teen pregnancy as proof of the continuing need for access to birth control and abortion, while Republicans often cite a need for returning to conservative values, often including abstinence.
An inverse correlation has been noted between teen pregnancy rates and the quality of education in a state. A positive correlation, albeit weak, appears between a city's teen pregnancy rate and its average summer night temperature, especially in the Southern U.S.