more than 4 million; 1 million adolescent U.S. females become pregnant every year ... see also overview of Pregnancy.
4,000,000 per year,
333,333 per month,
76,923 per week,
10,958 per day,
456 per hour,
7 per minute,
0 per second.
[Source statistic for calculation: "more than 4 million; 1 million adolescent U.S. females become pregnant every year" -- see also general information about data sources]
All statistics for Pregnancy
Prevalence/Incidence of Pregnancy: Online Medical Books
16 MEDICAL BOOKS ONLINE!
Review excerpts from medical books online, free, without registration,
for more information about the prevalence and/or incidence of Pregnancy.
Amenorrhea:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Amenorrhea is normal before puberty, after menopause, or during pregnancy and lactation; it’s pathologic at any other time. It usually results from anovulation due to hormonal abnormalities, such as decreased secretion of estrogen, gonadotropins, luteinizing hormone, and follicle-stimulating hormone; lack of ovarian response to gonadotropins; or constant presence of progesterone or other endocrine abnormalities.
Amenorrhea may also result from the absence of a uterus, endometrial damage, or from ovarian, adrenal, or pituitary tumors. It’s also linked to emotional disorders and is common in patients with severe disorders, such as depression and anorexia nervosa. Mild emotional disturbances tend merely to distort the ovulatory cycle, while severe psychic trauma may abruptly change the bleeding pattern or may completely suppress one or more full ovulatory cycles. Amenorrhea may also result from malnutrition, intense exercise, and prolonged hormonal contraceptive use. The incidence of primary amenorrhea in the United States is less than 1%. The incidence of secondary amenorrhea (due to some other cause than pregnancy) is about 4%.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Cesarean birth:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
The most common reasons for cesarean birth are malpresentation (such as shoulder or face presentation), fetal intolerance of labor distress, cephalopelvic disproportion ([CPD] the pelvis is too small to accommodate the fetal head), certain cases of toxemia, previous cesarean birth, and inadequate progress in labor (failure of induction).
Conditions causing fetal distress that indicate a need for cesarean birth include prolapsed cord with a live fetus, fetal hypoxia, abnormal fetal heart rate patterns, unfavorable intrauterine environment (from infection), and moderate to severe Rh isoimmunization. Less common maternal conditions that may necessitate cesarean birth include complete placenta previa, abruptio placentae, placenta accreta, malignant tumors, and chronic diseases in which delivery is indicated before term.
Cesarean birth may also be necessary if induction is contraindicated or difficult or if advanced labor increases the risk of morbidity and mortality.
In the case of a previous cesarean delivery, some physicians allow a subsequent vaginal delivery if the cesarean wasn’t classic or if the original reason for the cesarean no longer exists. However, vaginal delivery risks uterine rupture if the uterus is scarred.
The rising incidence of cesarean birth coincides with recent medical and technologic advances in fetal and placental surveillance and care. In the United States, 9% to 16% of all pregnancies terminate in cesarean births, rising to 17% to 25% in perinatal centers that handle high-risk deliveries.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Adolescent pregnancy:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Adolescent pregnancy is prevalent in all socioeconomic levels, and its contributing factors vary. Such factors may include ignorance about sexuality and contraception, increasing sexual activity at a young age, rebellion against parental influence, and a desire to escape an unhappy family situation and to fulfill emotional needs unmet by the family.
In the United States, an estimated 1 million adolescents become pregnant each year.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Cardiovascular disease in pregnancy:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Approximately 1% to 2% of pregnant females have cardiac disease, but the incidence is rising because medical treatment today allows more females with rheumatic heart disease (present in more than 80% of patients who develop cardiovascular complications) and congenital defects (present in 10% to 15% of patients) to reach childbearing age. Coronary artery disease accounts for about 2% of cardiovascular complications.
The diseased heart is sometimes unable to meet the normal demands of pregnancy: 25% increase in cardiac output, 40% to 50% increase in plasma volume, increased oxygen requirements, retention of salt and water, weight gain, and alterations in hemodynamics during delivery. This physiologic stress often leads to the heart’s failure to maintain adequate circulation (decompensation). The degree of decompensation depends on the patient’s age, the duration of cardiac disease, and the heart’s functional capacity at the pregnancy’s outset.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Pregnancy-induced hypertension:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
The cause of pregnancy-induced hypertension is unknown, but geographic, ethnic, racial, nutritional, immunologic, and familial factors and pre-existing vascular disease may contribute to its development. Age is also a factor. Primiparas who are older than age 35 are at higher risk for preeclampsia.
Preeclampsia develops in about 7% of pregnancies. Incidence is significantly higher in low socioeconomic groups. About 5% of females with preeclampsia develop eclampsia; of these, about 15% die from PIH itself or its complications. Fetal mortality is high due to the increased incidence of premature delivery and uteroplacental insufficiency.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Ectopic pregnancy:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Conditions that prevent or retard the fertilized ovum’s passage through the fallopian tube and into the uterine cavity include:
❑ diverticula, the formation of blind pouches that cause tubal abnormalities
❑ endometriosis, the presence of endometrial tissue outside the lining of the uterine cavity
❑ endosalpingitis, an inflammatory reaction that causes folds of the tubal mucosa to agglutinate, narrowing the tube
❑ pelvic inflammatory disease (PID), an infection of the oviducts and ovaries with adjacent tissue involvement
❑ previous surgery (tubal ligation or resection, or adhesions from previous abdominal or pelvic surgery)
❑ tumors pressing against the tube.
Ectopic pregnancy may result from congenital defects in the reproductive tract or ectopic endometrial implants in the tubal mucosa. The increased prevalence of sexually transmitted tubal infection may also be a factor. In whites, it occurs in 1 in 200 pregnancies; in nonwhites, in 1 in 120.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
About prevalence and incidence statistics:
The term 'prevalence' of Pregnancy usually refers to the estimated population
of people who are managing Pregnancy at any given time.
The term 'incidence' of Pregnancy refers to the annual diagnosis rate,
or the number of new cases of Pregnancy diagnosed each year.
Hence, these two statistics types can differ:
a short-lived disease like flu can have high annual incidence but low prevalence,
but a life-long disease like diabetes has a low annual incidence but high prevalence.
For more information see about prevalence and incidence statistics.
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