Family planning perspectives
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Comparative Study
Comparing the health risks and benefits of contraceptive choices.
Simulation models were used to compare the health consequences of birth control methods currently relied on by American women with those of using no method. The incidence of morbidity and mortality related to unintended pregnancies, live births, abortions, upper genital tract infections, tubal infertility, cardiovascular disease and reproductive cancers were estimated for hypothetical cohorts of 100,000 women aged 15-44. Women who never use any method and who never have an abortion would have an average of 18 births during their reproductive lifetime, compared with no more than five among women using any of the available birth control methods. ⋯ The proportion of women who would become infertile--estimated by taking into account the likelihood of developing upper genital tract infections and the probability that any pregnancies that occurred would be ectopic--is reduced substantially if women at low risk of sexually transmitted diseases use any method and if women at high risk use oral contraceptives or barrier and spermicide methods. Oral contraceptive use has a relatively small, independent effect on the risk of cardiovascular diseases, but it greatly augments that risk in combination with smoking and increased age. When ovarian, endometrial and breast cancers are considered together, there will be approximately 110 fewer diagnoses of these three cancers per 100,000 ever-users of the pill aged 15-54 than among 100,000 never-users; furthermore, prior to age 45, 100,000 ever-users will experience 10 fewer deaths from ovarian or endometrial cancers than never-users of the pill.(ABSTRACT TRUNCATED AT 250 WORDS)
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Comparative Study
The sexual and reproductive behavior of American women, 1982-1988.
Comparison of 1988 data from the National Survey of Family Growth with 1982 data reveals that the proportion of U. S. women who have had sexual intercourse rose slightly, from 86 percent to 89 percent. Among teenagers, the proportion sexually active rose from 47 percent to 53 percent; most of the change is attributable to increases occurring among white and nonpoor teenagers, thus narrowing racial and income differences. ⋯ Poor women are much more likely than nonpoor women to be using no method of contraception (15 vs. eight percent); among poor teenagers, this proportion reaches 25 percent. The level of contraceptive use at first intercourse among teenage women improved substantially between 1982 and 1988, however, rising from 48 percent to 65 percent. During 1984-1988, almost four in 10 births and almost six in 10 pregnancies among American women were unintended; most of these were mistimed, but 12 percent of births were unwanted ever.(ABSTRACT TRUNCATED AT 250 WORDS)
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Previously published estimates of probabilities of method and user failure for all contraceptive methods suffer from a serious methodological error and are biased downward, with the extent of bias unknown. Data from a World Health Organization clinical trial of the ovulation method of periodic abstinence were used to provide the first correctly calculated measures of method and user efficacy and to determine the characteristics that distinguish women who consciously take risks from those who do not. Probabilities of pregnancy during the first year are 3.1 percent during perfect use (method failure) and 86.4 percent during imperfect use (user failure). ⋯ Those who have a poor attitude toward the rules are more likely to take risks, including serious risks. Those who get away with taking a risk (i.e., do not get pregnant) are very likely to take risks again. Because breaking the most serious rules entails a 28 percent risk of pregnancy per cycle, those likely to take risks should be counseled about the probable consequences.
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A review of about 50 studies based on the 1982 National Survey of Family Growth (NSFG) illustrates the ways in which the survey sheds new light on trends and differentials in such areas as fertility, contraceptive use, infertility and the use of family planning services in the United States. The total fertility rate declined by nearly 50 percent between 1960 and 1973, from 3.6 to 1.9 births per woman, and changed little from then until 1982. It would appear that growing use of the pill, the IUD and sterilization--but principally the pill--is the prime factor in the dramatic decline in unwanted and mistimed births among married couples. ⋯ Despite the increasing levels of premarital exposure, however, there was actually a decline in teenage birthrates in the 1970s, which was due in part to the rising abortion rates among teenagers. Finally, although racial differences in fertility have narrowed, black women still have higher fertility than whites. The 1982 NSFG data suggest that four factors are principally responsible for the higher birthrates of black women: Blacks begin having intercourse earlier than whites; black women are one-third less likely to use contraceptives at first intercourse; they are more likely to be currently exposed to the risk of unplanned pregnancy and not using a method; and they have higher pregnancy rates when they are using no contraceptives or less-effective methods, such as the condom, rhythm and withdrawal.