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PubMed1983

Contraception.

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Contraception↗
PubMedDate not supplied

Contraceptive practice in the United States, 1982-1988.

Use of oral contraceptives by married women declined markedly between 1973 and 1982, but analysis of data from the 1988 National Survey of Family Growth shows that this decline stopped between 1982 and 1988. Reliance on female sterilization continued to increase, however, and it remained the leading method among currently married and formerly married women. Among women of all marital statuses, IUD use dropped by two-thirds between 1982 and 1988, from 2.2 million to 0.7 million women. As the proportion of less-educated, low-income, black and Hispanic contraceptive users choosing the IUD decreased, the proportion relying on female sterilization increased. Among college-educated white women, use of female sterilization did not increase; instead, pill use rose in this group. Condom use increased most sharply among teenagers and rose among never-married white and black women, but the pill was still the leading method by far in these groups, regardless of race. Among never-married black women, reliance on sterilization increased significantly between 1982 and 1988, with female sterilization becoming the second leading method. Use of the diaphragm declined sharply over the same period among never-married white women and among those who intended to have more children, as did use of periodic abstinence (rhythm and natural family planning) and foam.

Adolescent↗
PubMedDate not supplied

Contraceptive failure of the ovulation method of periodic abstinence.

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). Thus, if used perfectly, the ovulation method is very effective. However, it is extremely unforgiving of imperfect use. Because perfect compliance is difficult for many couples who desire intercourse when it is forbidden by ovulation method rules, and because the risk of pregnancy during imperfect use is so great, the ovulation method cannot be considered an ideal contraceptive method for the typical couple, who are likely to be less compliant than couples who volunteer for a clinical trial. The probability of an accidental pregnancy is greatest when any of the three most serious rules--no intercourse during mucus days, within three days after the day of peak fecundity or during times of stress--are broken. 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.

Adult↗
PubMed1997

An overview on the effectiveness of natural family planning.

Recent years have witnessed important developments in natural family planning (NFP), which is based on the observation of fertile and infertile periods of the menstrual cycle, so that the couple is able to know when sexual intercourse may lead to a pregnancy. A review of the main studies regarding the effectiveness of NFP showed a decrease in the Pearl Index and life table values from the early 1980s to date, indicating that progress both in the teaching and in the application of these contraception, methods has been achieved. The main cause of lack of success seems to be the misapplication of NFP rules, whereas the errors due to the method itself are few. Furthermore, it seems that the symptothermal method might give better results than the ovulation method, even though no comparative study has been carried out, and that the first studies on the lactational amenorrhea method show encouraging results. Finally, it seems that NFP is best suited for 'spacers' of pregnancies, rather than for 'limiters'. Indeed, the former are more likely to show good compliance, since the sexual abstinence periods are limited and an unwanted pregnancy is not regarded as a completely negative event.

Clinical Trials as Topic↗
PubMed1999

Efficacy of methods for determining ovulation in a natural family planning program.

OBJECTIVE: To evaluate the efficacy in ovulation detection of methods used in natural family planning in comparison with pelvic ultrasonography. DESIGN: Prospective analysis of ovulation detection by natural family planning methods and ultrasonography. SETTING: Natural family planning clinic, Department of Obstetrics and Gynecology, University of Naples "Federico II". PATIENT(S): Forty healthy women who were highly motivated to use natural family planning. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): Transvaginal ultrasonographic findings, urinary LH levels, salivary beta-glucuronidase activity, salivary ferning levels and characteristics of cervical mucus, and BBT. RESULT(S): Urinary LH level determination yielded a 100% correlation with the simultaneous ultrasonographic diagnosis of ovulation. Mucus sensations and characteristics yielded a 48.3% correlation when simultaneously evaluated with ovulation. Beta-glucuronidase levels yielded a 27.7% correlation. The salivary ferning test had a 36.8% ovulation-detection rate the day of ovulation, but 58.7% of results were uninterpretable. Body temperature measurements yielded a 30.4% correlation with the simultaneous ultrasonographic diagnosis of ovulation. CONCLUSION(S): Measuring urinary LH levels is an excellent method for determining ovulation. Although variations in mucus characteristics and basal body temperature correlate somewhat with ovulation, the length of the fertile period is overestimated with these methods. The salivary ferning test and measurement of beta-glucuronidase levels are not good methods for home ovulation testing.

Adult↗
PubMed1982

Sex of offspring of women using oral contraceptives, rhythm, and other methods of birth control around the time of conception.

Sex ratios were studied in a cohort of 33,205 newborns whose mothers had been questioned in early pregnancy about contraceptive use around the time of conception., The proportion of males was 0.517 (95% confidence limits [CL], 0.512 to 0.522). In the 9279 offspring of women who had used oral contraceptives (OC) in the 5 months prior to conception the sex ratio was 0.517 (0.507 to 0.527). There are sufficient numbers available for study for us to be 95% certain that OC causes no shift in sex ratio of 1% or more. Women who conceived within 2 months of stopping the pill had a small excess of males (0.528; 95% CL, 0.510 to 0.546), but this excess was probably due to chance. OC failures were followed by a raised sex ratio in the offspring (0.543; 95% CL, 0.509 to 0.577), and this excess of males was observed consistently in subgroups of maternal age, parity, race, and education. Failures of rhythm contraception were also associated with a consistent excess of male births (0.567; 95% CL, 0.514 to 0.620). No changes were observed after failures of IUDs, barrier, or chemical methods.

Adult↗
PubMed1986

Inaccuracy of basal body temperature charts in predicting urinary luteinizing hormone surges.

Sixty basal body temperature (BBT) charts were reviewed by three reproductive endocrinologists in an attempt retrospectively to predict the urinary luteinizing hormone (LH) surge. LH surges had been previously detected in all cycles with the use of a commercially available monoclonal antibody kit, Ovustick (Monoclonal Antibodies, Inc., Mountain View, CA). Surges were correctly predicted to the day (day 0) 18.3% to 30.0% of the time, to within 1 day on either side of day 0 56.7% to 70.0% of the time, to within 2 days 83.3% to 98.3% of the time, and to within 3 days 96.7% to 98.3% of the time. The BBT remains an inaccurate predictor of the day of the LH surge but does provide a reasonably accurate guide to the 2- to 3-day period on either side of the surge.

Body Temperature↗
PubMed1991

Evidence of marked sexual behavior change associated with low HIV-1 seroconversion in 149 married couples with discordant HIV-1 serostatus: experience at an HIV counselling center in Zaire.

To determine the effect of an HIV-1 counselling program on 149 married Zairian couples with discordant HIV-1 serology, the rates of HIV-1 seroconversion and reported condom utilization have been observed during 382.4 person-years of follow-up (minimum follow-up time per couple of 6 months). Before determination of HIV-1 serostatus and counselling, less than 5% of these couples had ever used a condom. One month after notification of HIV-1 serostatus and counselling, 70.7% of couples reported using condoms during all episodes of sexual intercourse. At 18 months follow-up, 77.4% of the 140 couples still being followed reported continued use of condoms during all episodes of sexual intercourse. At the time of notification of HIV-1 serostatus, 18 couples experienced acute psychological distress. Home-based counselling by trained nurses resolved these difficulties in all but three couples who subsequently divorced. Intensive counselling following notification of HIV-1 serostatus led to low rates of HIV-1 seroconversion (3.1% per 100 person-years of observation) in Zairian married couples with discordant HIV-1 serostatus who voluntarily attended an HIV counselling center.

Adult↗
PubMed1998

[Lactation-induced amenorrhea as birth control method].

Improving access to quality care in family planning, a recent document of the World Health Organization, reviews the epidemiological and clinical evidence relevant to medical eligibility of well established contraceptive methods. Breastfeeding is widely regarded as unreliable for individual contraception. The document, however, argues that the lactational amenorrhoea method (LAM) is a safe and effective family planning method. Worldwide, LAM is the most important way of fertility regulation and its efficacy is confirmed in many studies, with a 2% risk of pregnancy in the first six months after birth. Taking into account certain well defined conditions (frequent feedings, no supplementary feeding before 4-6 months, method only to be used in the absence of menstruation), LAM can be relied on for contraceptive protection for up to 1 year post partum.

Amenorrhea↗
PubMed2000

Use of birth control pills, condoms, and withdrawal among U.S. high school students.

PURPOSE: To examine the use of contraception at last sexual intercourse among currently sexually active adolescents. METHODS: We analyzed data from national school-based Youth Risk Behavior Surveys (YRBS) conducted in 1991, 1993, 1995, and 1997. The YRBS is a self-administered, anonymous survey which uses a national probability sample of U.S. students in public and private schools from grades 9 through 12. RESULTS: From 1991 to 1997, condom use significantly increased (from 46% to 57%), birth control pill use decreased (from 21% to 17%), and use of withdrawal significantly decreased (from 18% to 13%). In 1997, although more students were using condoms, 13% reported using withdrawal and 15% reported using no method to prevent pregnancy at last sexual intercourse. In 1997, condom use among females was significantly lower in the 9th grade than in the 12th grade (p <.001), whereas birth control pill use was higher (p <.001) and use of withdrawal remained stable. Among males, condom use and withdrawal use remained stable from 9th to 12th grade, whereas birth control pill use by their partner increased (p <.001). CONCLUSIONS: Inadequate contraceptive use among sexually active adolescents continues to be a major public health problem in the United States. For young people who will not remain sexually abstinent, families, health care providers, schools, and other influential societal institutions should promote the correct and continued use of condoms as essential protection against sexually transmitted diseases and human immunodeficiency virus infection.

Adolescent↗