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OBJECTIVE: To model the impacts of out-of-pocket cost of an over-the-counter (OTC) progestin-only pill on use and associated unintended pregnancy among U.S. women. STUDY DESIGN: Using data from a 2015 nationally representative survey of 2,539 U.S. women aged 15 to 44 assessing interest in using an OTC progestin-only pill, we used discrete survival analysis and a Markov model to analyze women's likelihood of using of an OTC pill at different price points and by sociodemographic characteristics. We modeled the impact of product price on the potential total number of U.S. users and on unintended pregnancies in 1 year among adult women at risk of unintended pregnancy. RESULTS: In a model assuming no out-of-pocket costs, more than 12.5 million adults and 1.75 million teens reported likely use of an OTC progestin-only pill if available. Among adults, this resulted in an estimated 8% decrease in unintended pregnancy in 1 year. Adult and teen women on average were willing to pay $15 and $10, respectively, resulting in 7.1 million adult and 1.3 million teen users and an estimated 5% decrease in unintended pregnancy among adults. CONCLUSIONS: At low and no out-of-pocket cost, a large population of women in the United States might likely use an OTC progestin-only pill. A low retail price and insurance coverage are necessary to provide equitable access to this method for low-income populations across the United States, fill current gaps in contraceptive access, and potentially decrease unintended pregnancy.
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Anticoncepcionais/economia , Gastos em Saúde/estatística & dados numéricos , Medicamentos sem Prescrição/economia , Adolescente , Adulto , Estudos Transversais , Feminino , Humanos , Modelos Estatísticos , Gravidez , Gravidez não Planejada , Progestinas/economia , Inquéritos e Questionários , Estados Unidos , Adulto JovemRESUMO
Emergency contraceptive (EC) pills may be less effective for women with higher body mass index (BMI), but little is known about public response to the fact that EC may lose efficacy as weight increases. In November 2013, European authorities changed the label for a levonorgestrel EC product to warn of a reduction in effectiveness for women with higher BMI, garnering significant media coverage in the United States. Ulipristal acetate (UPA) EC may be more effective than levonorgestrel for women with BMI levels designated as obese. Among 8,019 women who received UPA from the online pharmacy KwikMed from 2011 to 2015 and self-reported their height, weight and reasons for seeking UPA online, we analyzed changes in the proportion of women in different BMI categories before and after the label change. For the 25 month-period after the label change, the proportion of women in the obese category rose by 26.7 percentage points relative to the 35 months before (B = 0.2665, p < .01). Mean BMI (25.5 versus 29.4, p < .001) and average weight (148.6 pounds versus 175.5 pounds, p < .001) of users were higher after the label change. Some women appear to have acted on the information that EC efficacy may be associated with body weight.
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Anticoncepcionais Hormonais Pós-Coito/uso terapêutico , Rotulagem de Medicamentos , Levanogestrel/uso terapêutico , Norpregnadienos/uso terapêutico , Disponibilidade de Medicamentos Via Internet/estatística & dados numéricos , Adulto , Índice de Massa Corporal , Peso Corporal , Anticoncepção Pós-Coito/estatística & dados numéricos , Feminino , Humanos , Obesidade , Estados UnidosRESUMO
INTRODUCTION: Oral emergency contraception (EC) can prevent unintended pregnancy but it is important to start a regular method of contraception. Women in the UK usually access EC from a pharmacy but then need a subsequent appointment with a general practitioner or a sexual and reproductive health (SRH) service to access regular contraception. Unintended pregnancies can occur during this time. METHODS AND ANALYSIS: Bridge-It is a pragmatic cluster randomised cohort cross-over trial designed to determine whether pharmacist provision of a bridging supply of a progestogen-only pill (POP) plus rapid access to a local SRH clinic, results in increased uptake of effective contraception and prevents more unintended pregnancies than provision of EC alone. Bridge-It involves 31 pharmacies in three UK regions (London, Lothian and Tayside) aiming to recruit 626-737 women. Pharmacies will give EC (levonorgestrel) according to normal practice and recruit women to both intervention and the control phases of the study. In the intervention phase, pharmacists will provide the POP (desogestrel) and offer rapid access to an SRH clinic. In the control phase, pharmacists will advise women to attend a contraceptive provider for contraception (standard care).Women will be asked 4 months later about contraceptive use. Data linkage to abortion registries will provide abortion rates over 12 months. The sample size is calculated on the primary outcome of effective contraception use at 4 months (yes/no) with 90% power and a 5% level of significance. Abortion rates will be an exploratory secondary analysis. Process evaluation includes interviews with pharmacists, SRH clinicians and women. Cost-effectiveness analysis will use a healthcare system perspective and be expressed as incremental cost-effectiveness ratio. ETHICS AND DISSEMINATION: Ethical approval was received from South East Scotland REC June 2017. Results will be published in peer-reviewed journals and conference presentations. TRIAL REGISTRATION NUMBER: ISRCTN70616901.
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Comportamento Contraceptivo/estatística & dados numéricos , Anticoncepção Pós-Coito/estatística & dados numéricos , Aborto Induzido/estatística & dados numéricos , Adulto , Anticoncepção Pós-Coito/métodos , Anticoncepcionais Femininos/administração & dosagem , Estudos Cross-Over , Desogestrel/administração & dosagem , Feminino , Humanos , Levanogestrel/administração & dosagem , Farmácia/organização & administração , Projetos Piloto , Ensaios Clínicos Pragmáticos como Assunto , Gravidez , Gravidez não Planejada , Progestinas/administração & dosagem , Inquéritos e Questionários , Adulto JovemRESUMO
Objective: The aim of the study was to compare the effect of previously used contraceptive methods on women's short- and long-term fecundity. Use of hormonal contraception (HC) was compared with the use of a contraceptive mobile application (app). Methods: This real-life prospective observational study comprised 2874 women who were attempting to become pregnant using the Natural Cycles mobile app to monitor their fertility. The women registered to use the app between August 2014 and June 2016 with the intention of planning a pregnancy and had previously either used the same app to prevent pregnancy or had recently discontinued HC use. We calculated the average time to pregnancy (TTP) for all women who became pregnant during the study and performed Kaplan-Meier life-table analysis to examine the cumulative probabilities of pregnancy for all women in the study. Results: The average TTP was 2.3 (95% confidence interval [CI] 2.1, 2.4) and 3.7 (95% CI 3.4, 3.9) cycles for women who had previously used Natural Cycles and HC, respectively. The time to reach 30% pregnancy probability for women previously on HC was 1.6 (95% CI 1.5, 1.8) times longer than for women previously using Natural Cycles. There was no significant difference in the 13 cycle cumulated pregnancy probability between the two groups. Conclusion: The results show that fertility awareness-based methods of contraception increase short-term pregnancy rates relative to HC, but have no effect on long-term pregnancy rates.
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Anticoncepção/métodos , Contraceptivos Hormonais/efeitos adversos , Fertilidade/efeitos dos fármacos , Aplicativos Móveis , Taxa de Gravidez , Adulto , Feminino , Fertilização , Humanos , Tábuas de Vida , Gravidez , Estudos Prospectivos , Suécia/epidemiologia , Tempo , Adulto JovemRESUMO
OBJECTIVE: To investigate the association between contraceptive effectiveness of Natural Cycles and users' previous choice of contraceptive, and to evaluate the impact of shifting from other methods to Natural Cycles on the risk of unintended pregnancy. SETTING: Natural Cycles mobile application. PARTICIPANTS: 16 331 Natural Cycles users in Sweden for the prevention of pregnancy. OUTCOME MEASURES: Risk of unintended pregnancy. STUDY DESIGN: Real world evidence was collected from Natural Cycles users regarding contraceptive use prior to using Natural Cycles and sexual activity while using Natural Cycles. We calculated the typical use 1-year Pearl Index (PI) and 13-cycle failure rate of Natural Cycles for each cohort. The PI was compared with the population PI of their stated previous methods. RESULTS: For women who had used condoms before, the PI of Natural Cycles was the lowest at 3.5±0.5. For women who had used the pill before, the PI of Natural Cycles was the highest at 8.1±0.6. The frequency of unprotected sex on fertile days partially explained some of the observed variation in PI between cohorts. 89% of users switched to Natural Cycles from methods with higher or similar reported PIs. CONCLUSION: The effectiveness of Natural Cycles is influenced by previous contraceptive choice and this should be considered when evaluating the suitability of the method for the individual. We estimate that Natural Cycles usage can reduce the overall likelihood of having an unintended pregnancy by shifting usage from less effective methods.
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Comportamento Contraceptivo , Anticoncepção/métodos , Serviços de Planejamento Familiar/métodos , Ciclo Menstrual , Aplicativos Móveis , Gravidez não Planejada , Sexo Seguro , Adolescente , Adulto , Preservativos , Anticoncepcionais , Feminino , Fertilidade , Humanos , Pessoa de Meia-Idade , Gravidez , Suécia , Adulto JovemRESUMO
BACKGROUND: Incorporating thorough contraception counselling into an abortion consultation is challenging. We compared contraceptive choices and methods received between two counselling models: (1) telephone counselling separate from the abortion consultation and (2) face-to-face counselling integrated into the consultation. METHODS: We obtained de-identified data on demographic characteristics and contraceptive methods that had been chosen and received by women who had an abortion at British Pregnancy Advisory Service between 2011 and 2014 and had a choice of counselling models. We compared the characteristics of women who chose each model of counselling and the contraceptive methods they chose and received using Fisher's exact test, and used logistic regression to explore associations between counselling model and choice and receipt of Tier 1 contraceptive methods (intrauterine contraception, implant, sterilisation), controlling for covariates. RESULTS: The sample included 18 573 women. Women choosing telephone counselling were more likely to be non-White (34% vs 22%, P<0.001), to report prior difficulty obtaining contraception (40% vs 3%, P<0.001), and to have not used contraception at conception (37.1% vs 33.8%, P<0.001). Overall, 93% of women chose a contraceptive method after counselling. Telephone counselling was significantly associated with both choosing and receiving a Tier 1 method (OR 1.80, 95% CI 1.66 to 1.96 and OR 1.60, 95% CI 1.42 to 1.71, respectively). Fewer women who had telephone counselling received a less effective method (eg, condom, diaphragm) compared with those who chose integrated counselling (6.0% vs 19.2%, P<0.001). DISCUSSION: Telephone-based contraception counselling separate from the abortion consultation may serve some women better than integrated counselling, particularly those reporting past difficulty obtaining contraception.
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Aborto Induzido , Contracepção Reversível de Longo Prazo , Anticoncepção , Feminino , Finlândia , Humanos , GravidezRESUMO
OBJECTIVE: To examine reasons for seeking abortion services outside the formal healthcare system in Great Britain, where abortion is legally available. STUDY DESIGN: We conducted a mixed-methods study among women resident in England, Scotland, and Wales who requested at-home medication abortion through online telemedicine initiative Women on Web (WoW) between November 22, 2016, and March 22, 2017. We examined the demographics and circumstances of all women requesting early medication abortion and conducted a content analysis of a sample of their anonymized emails to the service to explore their reasons for seeking help. RESULTS: Over a 4-month period, 519 women contacted WoW seeking medication abortion. These women were diverse with respect to age, parity, and circumstance. One hundred eighty women reported 209 reasons for seeking abortion outside the formal healthcare setting. Among all reasons, 49% were access barriers, including long waiting times, distance to clinic, work or childcare commitments, lack of eligibility for free NHS services, and prior negative experiences of abortion care; 30% were privacy concerns, including lack of confidentiality of services, perceived or experienced stigma, and preferring the privacy and comfort of using pills at home; and 18% were controlling circumstances, including partner violence and partner/family control. CONCLUSION: Despite the presence of abortion services in Great Britain, a diverse group of women still experiences logistical and personal barriers to accessing care through the formal healthcare system, or prefer the privacy of conducting their abortions in their own homes. Health services commissioning bodies could address existing barriers if supported by policy frameworks. IMPLICATIONS: The presence of multiple barriers to accessing abortion care in Great Britain highlights the need for future guidelines to recommend a more woman-centered approach to service provision. Reducing the number of clinic visits and designing services to meet the needs of those living in controlling circumstances are particularly important goals.
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Abortivos não Esteroides/administração & dosagem , Aborto Induzido/psicologia , Acessibilidade aos Serviços de Saúde/estatística & dados numéricos , Mifepristona/administração & dosagem , Misoprostol/administração & dosagem , Autoadministração/psicologia , Aborto Induzido/métodos , Adulto , Feminino , Humanos , Pessoa de Meia-Idade , Gravidez , Reino Unido , Adulto JovemRESUMO
OBJECTIVE: We modeled the potential impact of novel male contraceptive methods on averting unintended pregnancies in the United States, South Africa, and Nigeria. STUDY DESIGN: We used an established methodology for calculating the number of couple-years of protection provided by a given contraceptive method mix. We compared a "current scenario" (reflecting current use of existing methods in each country) against "future scenarios," (reflecting whether a male oral pill or a reversible vas occlusion was introduced) in order to estimate the impact on unintended pregnancies averted. Where possible, we based our assumptions on acceptability data from studies on uptake of novel male contraceptive methods. RESULTS: Assuming that only 10% of interested men would take up a novel male method and that users would comprise both switchers (from existing methods) and brand-new users of contraception, the model estimated that introducing the male pill or reversible vas occlusion would decrease unintended pregnancies by 3.5% to 5.2% in the United States, by 3.2% to 5% in South Africa, and by 30.4% to 38% in Nigeria. Alternative model scenarios are presented assuming uptake as high as 15% and as low as 5% in each location. Model results were sensitive to assumptions regarding novel method uptake and proportion of switchers vs. new users. CONCLUSION: Even under conservative assumptions, the introduction of a male pill or temporary vas occlusion could meaningfully contribute to averting unintended pregnancies in a variety of contexts, especially in settings where current use of contraception is low. IMPLICATIONS: Novel male contraceptives could play a meaningful role in averting unintended pregnancies in a variety of contexts. The potential impact is especially great in settings where current use of contraception is low and if novel methods can attract new contraceptive users.
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Anticoncepção , Modelos Teóricos , Taxa de Gravidez , Gravidez não Planejada , Feminino , Humanos , Masculino , Nigéria , Gravidez , África do Sul , Estados UnidosRESUMO
Objectives To assess self reported outcomes and adverse events after self sourced medical abortion through online telemedicine.Design Population based study.Setting Republic of Ireland and Northern Ireland, where abortion is unavailable through the formal healthcare system except in a few restricted circumstances.Population 1000 women who underwent self sourced medical abortion through Women on Web (WoW), an online telemedicine service, between 1 January 2010 and 31 December 2012.Main outcome measures Successful medical abortion: the proportion of women who reported ending their pregnancy without surgical intervention. Rates of adverse events: the proportion who reported treatment for adverse events, including receipt of antibiotics and blood transfusion, and deaths reported by family members, friends, or the authorities. Care seeking for symptoms of potential complications: the frequency with which women reported experiencing symptoms of a potentially serious complication and the proportion who reported seeking medical attention as advised.Results In 2010-12, abortion medications (mifepristone and misoprostol) were sent to 1636 women and follow-up information was obtained for 1158 (71%). Among these, 1023 women confirmed use of the medications, and follow-up information was available for 1000. At the time women requested help from WoW, 781 (78%) were <7 weeks pregnant and 219 (22%) were 7-9 weeks pregnant. Overall, 94.7% (95% confidence interval 93.1% to 96.0%) reported successfully ending their pregnancy without surgical intervention. Seven women (0.7%, 0.3% to 1.5%) reported receiving a blood transfusion, and 26 (2.6%, 1.7% to 3.8%) reported receiving antibiotics (route of administration (IV or oral) could not be determined). No deaths resulting from the intervention were reported by family, friends, the authorities, or the media. Ninety three women (9.3%, 7.6% to 11.3%) reported experiencing any symptom for which they were advised to seek medical advice, and, of these, 87 (95%, 87.8% to 98.2%) sought attention. None of the five women who did not seek medical attention reported experiencing an adverse outcome.Conclusions Self sourced medical abortion using online telemedicine can be highly effective, and outcomes compare favourably with in clinic protocols. Reported rates of adverse events are low. Women are able to self identify the symptoms of potentially serious complications, and most report seeking medical attention when advised. Results have important implications for women worldwide living in areas where access to abortion is restricted.
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Aborto Induzido/efeitos adversos , Aborto Induzido/métodos , Internet , Autorrelato , Telemedicina , Abortivos não Esteroides/efeitos adversos , Abortivos não Esteroides/uso terapêutico , Abortivos Esteroides/efeitos adversos , Abortivos Esteroides/uso terapêutico , Adulto , Feminino , Seguimentos , Idade Gestacional , Humanos , Irlanda , Pessoa de Meia-Idade , Mifepristona/efeitos adversos , Mifepristona/uso terapêutico , Misoprostol/efeitos adversos , Misoprostol/uso terapêutico , Irlanda do Norte , Gravidez , Resultado do Tratamento , Adulto JovemAssuntos
Intervalo entre Nascimentos , Parto , Feminino , Humanos , Gravidez , Resultado da Gravidez , Fatores de RiscoRESUMO
This study examined differences in women's anticipated emotional orientations towards unintended pregnancy by relationship status and race/ethnicity. Data from a prospective survey of 437 women aged 18-44 who intended no more children for at least two years were analyzed along with 27 in-depth interviews among a diverse sub-sample. Cohabiting women and women in a romantic relationship not living together were less likely to profess happiness (OR=0.42, p<.05, OR=0.25, p<.01, respectively), even when partners' intentions/feelings were controlled. The most prominent factor underlying negative feelings was partners' anticipated lack of engagement with the emotional, physical, and financial toll of unintended childbearing. Contrary to conventional wisdom regarding the "Hispanic paradox", foreign-born and US-born Latinas were no more likely to profess happiness than non-Hispanic whites or blacks. Moreover, foreign-born Latinas whose survey responses indicated happiness often revealed highly negative feelings at in-depth interview, citing pressure to conform to sociocultural norms surrounding motherhood and abortion.
RESUMO
CONTEXT: Contraceptive failure rates measure a woman's probability of becoming pregnant while using a contraceptive. Information about these rates enables couples to make informed contraceptive choices. Failure rates were last estimated for 2002, and social and economic changes that have occurred since then necessitate a reestimation. METHODS: To estimate failure rates for the most commonly used reversible methods in the United States, data from the 2006-2010 National Survey of Family Growth were used; some 15,728 contraceptive use intervals, contributed by 6,683 women, were analyzed. Data from the Guttmacher Institute's 2008 Abortion Patient Survey were used to adjust for abortion underreporting. Kaplan-Meier methods were used to estimate the associated single-decrement probability of failure by duration of use. Failure rates were compared with those from 1995 and 2002. RESULTS: Long-acting reversible contraceptives (the IUD and the implant) had the lowest failure rates of all methods (1%), while condoms and withdrawal carried the highest probabilities of failure (13% and 20%, respectively). However, the failure rate for the condom had declined significantly since 1995 (from 18%), as had the failure rate for all hormonal methods combined (from 8% to 6%). The failure rate for all reversible methods combined declined from 12% in 2002 to 10% in 2006-2010. CONCLUSIONS: These broad-based declines in failure rates reverse a long-term pattern of minimal change. Future research should explore what lies behind these trends, as well as possibilities for further improvements.
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Coito Interrompido , Preservativos , Anticoncepcionais , Implantes de Medicamento , Falha de Equipamento/estatística & dados numéricos , Dispositivos Intrauterinos , Taxa de Gravidez , Aborto Induzido/estatística & dados numéricos , Feminino , Humanos , Gravidez , Inquéritos e Questionários , Falha de Tratamento , Estados UnidosRESUMO
OBJECTIVE: To compare use of contraceptive methods at last heterosexual intercourse among 15-44year-old women and men at risk of unintended pregnancy in the United States. STUDY DESIGN: We employed data from the National Survey of Family Growth 2006-2013. We considered women and men to be at risk of unintended pregnancy if they had intercourse in the last month, regardless of contraceptive use, and if they or their partner had the ability to get pregnant and was not trying to become pregnant. We categorized multiple method use according to the most effective method reported. To explore the contributions of age and relationship status to differences in reporting between women and men, we conducted sensitivity analyses, limiting age to 25-44years and union status to married and cohabiting. RESULTS: Distributions of methods used at last intercourse differed for women and men. A positive difference reflects higher reporting among women, while a negative difference reflects higher reporting among men. Percentage-point differences were largest for reported use of no method (-7.6) and female sterilization (+7.4), each p<.001. These differences persisted even when the sample was restricted by age and relationship status. CONCLUSION: Estimates of men's contraceptive use may be subject to underreporting of their partners' method use, particularly when their female partner is sterilized. Neither older age nor married and cohabiting relationship status accounted for the observed differences. Further research is needed to explore the factors underlying reporting differences between women and men with respect to female sterilization and use of no method. IMPLICATIONS (50): Characterizing the determinants of contraceptive use among men and the relationship of men's pregnancy intentions, feelings and desires to contraceptive use are important future research goals. To ensure valid results, researchers must be aware of the potential for underreporting of method use among men, particularly with respect to female sterilization.
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Comportamento Contraceptivo/estatística & dados numéricos , Anticoncepção/estatística & dados numéricos , Adulto , Comportamento Contraceptivo/psicologia , Características da Família , Feminino , Inquéritos Epidemiológicos , Humanos , Masculino , Gravidez , Gravidez não Planejada , Risco , Distribuição por Sexo , Parceiros Sexuais , Esterilização Reprodutiva/estatística & dados numéricos , Estados UnidosRESUMO
OBJECTIVES: This study describes women's reasons for seeking ulipristal acetate (UPA) for emergency contraception (EC) through the only authorized online retailer for UPA EC in the US. STUDY DESIGN: Women aged 14 to 59 years, living in states that allow prescription medications to be shipped from out-of-state, accessed the KwikMed online pharmacy between January 2011 and December 2015. After completing a medical eligibility screener, women answered optional multiple-choice questions. To obtain UPA through KwikMed, individuals must be female, 50 years of age or younger, not currently pregnant or breastfeeding and not attempting to order UPA more than once within 30 days or more than four times per year. RESULTS: Over the 5-year period, KwikMed provided 8019 prescriptions for UPA, and the number of women using this service more than tripled over time. Among women who responded to the survey questions (n=7133; response rate = 89%), most sought EC because of a condom failure (45.3%) or because they did not use regular contraception (41.2%). More than half (53.5%) of women reported that they chose UPA because of its effectiveness compared to levonorgestrel EC pills, and 58.9% preferred ordering UPA online because they found it easier than getting it from a doctor, clinic or pharmacy. CONCLUSIONS: This study documents the importance of providing confidential services for acquiring EC online. Benefits of online access include convenience, less embarrassment, avoiding situations in which a provider might refuse to provide EC because of their own ideological belief and more reliable availability for this time-sensitive contraceptive. IMPLICATIONS: Though physical, logistical and societal barriers can restrict women's access to EC, this study demonstrates that providing access to UPA online empowers women to obtain EC when they need it.
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Anticoncepcionais Pós-Coito/provisão & distribuição , Acessibilidade aos Serviços de Saúde , Norpregnadienos/provisão & distribuição , Disponibilidade de Medicamentos Via Internet , Prescrições/estatística & dados numéricos , Adolescente , Adulto , Atitude do Pessoal de Saúde , Feminino , Humanos , Privacidade/psicologia , Inquéritos e Questionários , Estados Unidos , Adulto JovemRESUMO
CONTEXT: Unintended pregnancy is a universal benchmark for reproductive health, but whether variations reflect differences in measurement and how well measures predict pregnancy outcomes warrant further examination. U.S. and British measures of unintended and unplanned pregnancy offer a useful comparison. METHODS: Some 220 women seeking pregnancy testing at the Columbia University Medical Center in 2005 responded to three pregnancy measures: a binary timing-based measure of unintended pregnancy (TMUP); a multi-item measure of timing-based intentions and planning behaviors, the London Measure of Unplanned Pregnancy (LMUP); and a measure combining intentions (from the TMUP) and how women would feel about a positive pregnancy test. Six-month pregnancy status was assessed among 159 respondents. Estimates of unintended and unplanned pregnancy were calculated using the TMUP and the LMUP, and receiver operating characteristic (ROC) curves were generated to assess congruence. RESULTS: According to the TMUP, 76% of pregnancies were unintended; by contrast, LMUP scores categorized 39% as unplanned. The ROC curve indicated that expanding the range of scores for classifying pregnancies as unplanned on the LMUP would achieve greater congruence between these measures. At six months, the proportion of pregnancies that had ended in abortion was 42% of those classified as unintended using the TMUP, 60% of those classified as unplanned using the LMUP and 71% of those that women said they had not intended and were very upset about. CONCLUSIONS: U.S. and British measures of unintended pregnancy are not directly comparable, and a measure combining intentions and feelings may better predict pregnancy outcomes.
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Intenção , Gravidez não Planejada/psicologia , Aborto Induzido/estatística & dados numéricos , Adolescente , Adulto , Feminino , Humanos , Gravidez , Curva ROC , Fatores de Tempo , Reino Unido , Estados Unidos , Adulto JovemRESUMO
BACKGROUND: Progestin-only contraceptives (POCs) are appropriate for many women who cannot or should not take estrogen. POCs include injectables, intrauterine contraception, implants, and oral contraceptives. Many POCs are long-acting, cost-effective methods of preventing pregnancy. However, concern about weight gain can deter the initiation of contraceptives and cause early discontinuation among users. OBJECTIVES: The primary objective was to evaluate the association between progestin-only contraceptive use and changes in body weight. SEARCH METHODS: Until 4 August 2016, we searched MEDLINE, CENTRAL, POPLINE, LILACS, ClinicalTrials.gov, and ICTRP. For the initial review, we contacted investigators to identify other trials. SELECTION CRITERIA: We considered comparative studies that examined a POC versus another contraceptive method or no contraceptive. The primary outcome was mean change in body weight or mean change in body composition. We also considered the dichotomous outcome of loss or gain of a specified amount of weight. DATA COLLECTION AND ANALYSIS: Two authors extracted the data. Non-randomized studies (NRS) need to control for confounding factors. We used adjusted measures for the primary effects in NRS or the results of matched analysis from paired samples. If the report did not provide adjusted measures for the primary analysis, we used unadjusted outcomes. For RCTs and NRS without adjusted measures, we computed the mean difference (MD) with 95% confidence interval (CI) for continuous variables. For dichotomous outcomes, we calculated the Mantel-Haenszel odds ratio (OR) with 95% CI. MAIN RESULTS: We found 22 eligible studies that included a total of 11,450 women. With 6 NRS added to this update, the review includes 17 NRS and 5 RCTs. By contraceptive method, the review has 16 studies of depot medroxyprogesterone acetate (DMPA), 4 of levonorgestrel-releasing intrauterine contraception (LNG-IUC), 5 for implants, and 2 for progestin-only pills.Comparison groups did not differ significantly for weight change or other body composition measure in 15 studies. Five studies with moderate or low quality evidence showed differences between study arms. Two studies of a six-rod implant also indicated some differences, but the evidence was low quality.Three studies showed differences for DMPA users compared with women not using a hormonal method. In a retrospective study, weight gain (kg) was greater for DMPA versus copper (Cu) IUC in years one (MD 2.28, 95% CI 1.79 to 2.77), two (MD 2.71, 95% CI 2.12 to 3.30), and three (MD 3.17, 95% CI 2.51 to 3.83). A prospective study showed adolescents using DMPA had a greater increase in body fat (%) compared with a group not using a hormonal method (MD 11.00, 95% CI 2.64 to 19.36). The DMPA group also had a greater decrease in lean body mass (%) (MD -4.00, 95% CI -6.93 to -1.07). A more recent retrospective study reported greater mean increases with use of DMPA versus Cu IUC for weight (kg) at years 1 (1.3 vs 0.2), 4 (3.5 vs 1.9), and 10 (6.6 vs 4.9).Two studies reported a greater mean increase in body fat mass (%) for POC users versus women not using a hormonal method. The method was LNG-IUC in two studies (reported means 2.5 versus -1.3; P = 0.029); (MD 1.60, 95% CI 0.45 to 2.75). One also studied a desogestrel-containing pill (MD 3.30, 95% CI 2.08 to 4.52). Both studies showed a greater decrease in lean body mass among POC users. AUTHORS' CONCLUSIONS: We considered the overall quality of evidence to be low; more than half of the studies had low quality evidence. The main reasons for downgrading were lack of randomizations (NRS) and high loss to follow-up or early discontinuation.These 22 studies showed limited evidence of change in weight or body composition with use of POCs. Mean weight gain at 6 or 12 months was less than 2 kg (4.4 lb) for most studies. Those with multiyear data showed mean weight change was approximately twice as much at two to four years than at one year, but generally the study groups did not differ significantly. Appropriate counseling about typical weight gain may help reduce discontinuation of contraceptives due to perceptions of weight gain.