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. 2014 Mar 30;2014(3):CD010915.
doi: 10.1002/14651858.CD010915.pub2.

Behavioral interventions for improving dual-method contraceptive use

Laureen M Lopez  1 , Laurie L Stockton, Mario Chen, Markus J Steiner, Maria F Gallo
Affiliations

Behavioral interventions for improving dual-method contraceptive use

Laureen M Lopez et al. Cochrane Database Syst Rev. .

Abstract

Background: Dual-method contraception refers to using condoms as well as another modern method of contraception. The latter (usually non-barrier) method is commonly hormonal (e.g., oral contraceptives) or a non-hormonal intrauterine device. Use of two methods can better prevent pregnancy and the transmission of HIV and other sexually transmitted infections (STIs) compared to single-method use. Unprotected sex increases risk for disease, disability, and mortality in many areas due to the prevalence and incidence of HIV/STI. Millions of women, especially in lower-resource areas, also have an unmet need for protection against unintended pregnancy.

Objectives: We examined comparative studies of behavioral interventions for improving use of dual methods of contraception. Dual-method use refers to using condoms as well as another modern contraceptive method. Our intent was to identify effective interventions for preventing pregnancy as well as HIV/STI transmission.

Search methods: Through January 2014, we searched MEDLINE, CENTRAL, POPLINE, EMBASE, COPAC, and Open Grey. In addition, we searched ClinicalTrials.gov and ICTRP for current trials and trials with relevant data or reports. We examined reference lists of pertinent papers, including review articles, for additional reports.

Selection criteria: Studies could be either randomized or non-randomized. They examined a behavioral intervention with an educational or counseling component to encourage or improve the use of dual methods, i.e., condoms and another modern contraceptive. The intervention had to address preventing pregnancy as well as the transmission of HIV/STI. The program or service could be targeted to individuals, couples, or communities. The comparison condition could be another behavioral intervention to improve contraceptive use, usual care, other health education, or no intervention.Studies had to report use of dual methods, i.e., condoms plus another modern contraceptive method. We focused on the investigator's assessment of consistent dual-method use or use at last sex. Outcomes had to be measured at least three months after the behavioral intervention began.

Data collection and analysis: Two authors evaluated abstracts for eligibility and extracted data from included studies. For the dichotomous outcomes, the Mantel-Haenszel odds ratio (OR) with 95% CI was calculated using a fixed-effect model. Where studies used adjusted analysis, we presented the results as reported by the investigators. No meta-analysis was conducted due to differences in interventions and outcome measures.

Main results: We identified four studies that met the inclusion criteria: three randomized controlled trials and a pilot study for one of the included trials. The interventions differed markedly: computer-delivered, individually tailored sessions; phone counseling added to clinic counseling; and case management plus a peer-leadership program. The latter study, which addressed multiple risks, showed an effect on contraceptive use. Compared to the control group, the intervention group was more likely to report consistent dual-method use, i.e., oral contraceptives and condoms. The reported relative risk was 1.58 at 12 months (95% CI 1.03 to 2.43) and 1.36 at 24 months (95% CI 1.01 to 1.85). The related pilot study showed more reporting of consistent dual-method use for the intervention group compared to the control group (reported P value = 0.06); the investigators used a higher alpha (P < 0.10) for this pilot study. The other two trials did not show any significant difference between the study groups in reported dual-method use or in test results for pregnancy or STIs at 12 or 24 months.

Authors' conclusions: We found few behavioral interventions for improving dual-method contraceptive use and little evidence of effectiveness. A multifaceted program showed some effect but only had self-reported outcomes. Two trials were more applicable to clinical settings and had objective outcomes measures, but neither showed any effect. The included studies had adequate information on intervention fidelity and sufficient follow-up periods for change to occur. However, the overall quality of evidence was considered low. Two trials had design limitations and two had high losses to follow up, as often occurs in contraceptive trials. Good quality studies are still needed of carefully designed and implemented programs or services.

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Conflict of interest statement

No known conflicts.

Figures

1
1
Study flow diagram.
1.1
1.1. Analysis
Comparison 1 Pregnancy and STI prevention: computer‐delivered, tailored versus non‐tailored intervention, Outcome 1 Any dual‐method use (at 24 months).
1.2
1.2. Analysis
Comparison 1 Pregnancy and STI prevention: computer‐delivered, tailored versus non‐tailored intervention, Outcome 2 Unplanned pregnancy (at 24 months).
1.3
1.3. Analysis
Comparison 1 Pregnancy and STI prevention: computer‐delivered, tailored versus non‐tailored intervention, Outcome 3 Any sexually transmitted infection (at 24 months).
2.1
2.1. Analysis
Comparison 2 Adherence to OCs and condom use: counseling + phone calls versus counseling versus standard care, Outcome 1 Dual‐method use: counseling + phone versus counseling.
2.2
2.2. Analysis
Comparison 2 Adherence to OCs and condom use: counseling + phone calls versus counseling versus standard care, Outcome 2 Dual‐method use: counseling versus standard care.
2.3
2.3. Analysis
Comparison 2 Adherence to OCs and condom use: counseling + phone calls versus counseling versus standard care, Outcome 3 Pregnancy (by 12 months).
2.4
2.4. Analysis
Comparison 2 Adherence to OCs and condom use: counseling + phone calls versus counseling versus standard care, Outcome 4 Sexually transmitted infection (by 12 months).
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References

References to studies included in this review

Berenson 2012 {published and unpublished data}
    1. Berenson A B, Rahman M. A randomized controlled study of two educational interventions on adherence with oral contraceptives and condoms. Contraception 2012;86(6):716‐24. - PMC - PubMed
Peipert 2008 {published and unpublished data}
    1. Peipert J F, Zhao Q, Meints L, Peipert B J, Redding C A, Allsworth J E. Adherence to dual‐method contraceptive use. Contraception 2011;84(3):252‐8. - PMC - PubMed
    1. Peipert J, Redding CA, Blume J, Allsworth JE, Iannuccillo K, Lozowski F, Mayer K, Morokoff PJ, Rossi JS. Design of a stage‐matched intervention trial to increase dual method contraceptive use (Project PROTECT). Contemporary Clinical Trials 2007;28(5):626‐37. - PubMed
    1. Peipert JF, Redding CA, Blume JD, Allsworth JE, Matteson KA, Lozowski F, et al. Tailored intervention to increase dual‐contraceptive method use: a randomized trial to reduce unintended pregnancies and sexually transmitted infections. American Journal of Obstetrics & Gynecology 2008;198(6):630.e1‐8. - PMC - PubMed
Sieving 2012 {published and unpublished data}
    1. Sieving RE, Bernat DH, Resnick MD, Oliphant J, Pettingell S, Plowman S, et al. A clinic‐based youth development program to reduce sexual risk behaviors among adolescent girls: prime time pilot study. Health Promotion Practice. 2011/05/25 2012; Vol. 13, issue 4:462‐71. - PubMed
Sieving 2013 {published and unpublished data}
    1. Sieving RE, McMorris BJ, Beckman KJ, Pettingell SL, Secor‐Turner M, Kugler K, et al. Prime Time: 12‐month sexual health outcomes of a clinic‐based intervention to prevent pregnancy risk behaviors. Journal of Adolescent Health 2011;49(2):172‐9. - PMC - PubMed
    1. Sieving RE, McRee AL, McMorris BJ, Beckman KJ, Pettingell SL, Bearinger LH, et al. Prime time: sexual health outcomes at 24 months for a clinic‐linked intervention to prevent pregnancy risk behaviors. JAMA Pediatrics 2013;167(4):333‐40. - PMC - PubMed
    1. Tanner AE, Secor‐Turner M, Garwick A, Sieving R, Rush K. Engaging vulnerable adolescents in a pregnancy prevention program: perspectives of Prime Time staff. Journal of Pediatric Health Care 2010;26(4):254‐65. - PMC - PubMed

References to studies excluded from this review

Bearss 1995 {published data only}
    1. Bearss N, Santelli JS, Papa P. A pilot program of contraceptive continuation in six school‐based clinics. Journal of Adolescent Health. 1995/09/01 1995; Vol. 17, issue 3:178‐83. - PubMed
Boyer 2005 {published and unpublished data}
    1. Boyer CB, Shafer MA, Shaffer RA, Brodine SK, Pollack LM, Betsinger K, et al. Evaluation of a cognitive‐behavioral, group, randomized controlled intervention trial to prevent sexually transmitted infections and unintended pregnancies in young women. Preventive Medicine 2005;40(4):420‐31. - PubMed
Campero 2011 {published data only}
    1. Campero L, Walker D, Atienzo EE, Gutierrez JP. A quasi‐experimental evaluation of parents as sexual health educators resulting in delayed sexual initiation and increased access to condoms. Journal of Adolescence 2011;34(2):215‐23. - PubMed
Exner 2009 {published data only}
    1. Exner TM, Mantell JE, Adeokun LA, Udoh IA, Ladipo OA, Delano GE, et al. Mobilizing men as partners: The results of an intervention to increase dual protection among Nigerian men. Health Education Research 2009; Vol. 24, issue 5:846‐54. - PMC - PubMed
Exner 2011 {published data only}
    1. Exner TM, Mantell JE, Hoffman S, Adams‐Skinner J, Stein ZA, Leu CS. Project REACH: a provider‐delivered dual protection intervention for women using family planning services in New York City. AIDS Care. 2011/01/29 2011; Vol. 23, issue 4:467‐75. - PMC - PubMed
Fogarty 2001 {published data only}
    1. Fogarty LA, Heilig CM, Armstrong K, Cabral R, Galavotti C, Gielen AC, et al. Long‐term effectiveness of a peer‐based intervention to promote condom and contraceptive use among HIV‐positive and at‐risk women. Public Health Reports. 2002/03/13 2001; Vol. 116 Suppl 1:103‐19. - PMC - PubMed
    1. Gielen A C, Fogarty L A, Armstrong K, Green B M, Cabral R, Milstein B, et al. Promoting condom use with main partners: A behavioral intervention trial for women. AIDS & Behavior 2001;5(3):193‐204.
Gold 2007 {published data only}
    1. Gold MA. The S.A.F.E. Study : Computer‐Aided Counseling to Prevent Teen Pregnancy/Sexually Transmitted Diseases (STDs). www.clinicaltrials.gov/show/ NCT00151151 (accessed 17 Oct 2013). [NCT01303575‎]
Harvey 2004 {published data only}
    1. Harvey SM, Henderson JT, Thorburn S, Beckman LJ, Casillas A, Mendez L, et al. A randomized study of a pregnancy and disease prevention intervention for Hispanic couples. Perspectives on Sexual and Reproductive Health 2004;36(4):162‐9. - PubMed
Heeren 2013 {published data only}
    1. Heeren GA, Jemmott JB, 3rd, Ngwane Z, Mandeya A, Tyler JC. A randomized controlled pilot study of an HIV risk‐reduction intervention for sub‐Saharan African university students. AIDS Behavior. 2012/01/17 2013; Vol. 17, issue 3:1105‐15. - PMC - PubMed
Kirby 2010 {published data only}
    1. Kirby D, Raine T, Thrush G, Yuen C, Sokoloff A, Potter SC. Impact of an intervention to improve contraceptive use through follow‐up phone calls to female adolescent clinic patients. Perspectives on Sexual and Reproductive Health 2010;42(4):251‐7. [NCT00230880] - PMC - PubMed
Larsson 2006 {published data only}
    1. Larsson M, Eurenius K, Westerling R, Tyden T. Evaluation of a sexual education intervention among Swedish high school students. Scandinavian Journal of Public Health 2006;34(2):124‐31. - PubMed
Mark 2007 {published data only}
    1. Mark KE, Meinzen‐Derr J, Stephenson R, Haworth A, Ahmed Y, Duncan D, et al. Contraception among HIV concordant and discordant couples in Zambia: a randomized controlled trial. Journal of Womens Health (Larchmt). 2007/10/17 2007; Vol. 16, issue 8:1200‐10. - PubMed
Ngure 2009 {published and unpublished data}
    1. Lingappa JR, Kahle E, Mugo N, Mujugira A, Magaret A, Baeten J, et al. Characteristics of HIV‐1 discordant couples enrolled in a trial of HSV‐2 suppression to reduce HIV‐1 transmission: the partners study. PLoS One. 2009/05/01 2009; Vol. 4, issue 4:e5272. - PMC - PubMed
    1. Ngure K, Heffron R, Mugo N, Irungu E, Celum C, Baeten JM. Successful increase in contraceptive uptake among Kenyan HIV‐1‐serodiscordant couples enrolled in an HIV‐1 prevention trial. AIDS. 2010/02/02 2009; Vol. 23 Suppl 1:S89‐95. [NCT00194519] - PMC - PubMed
Parkes 2009 {published data only}
    1. Parkes A, Wight D, Henderson M, Stephenson J, Strange V. Contraceptive method at first sexual intercourse and subsequent pregnancy risk: findings from a secondary analysis of 16‐year‐old girls from the RIPPLE and SHARE studies. Journal of Adolescent Health 2009;44(1):55‐63. - PMC - PubMed
Petersen 2007 {published and unpublished data}
    1. Petersen R, Albright J, Garrett JM, Curtis KM. Pregnancy and STD prevention counseling using an adaptation of motivational interviewing: a randomized controlled trial. Perspectives on Sexual and Reproductive Health 2007;39(1):21‐8. - PubMed
Roye 2007 {published and unpublished data}
    1. Roye C, Perlmutter Silverman P, Krauss B. A brief, low‐cost, theory‐based intervention to promote dual method use by black and Latina female adolescents: a randomized clinical trial. Health Education & Behavior 2007;34:608‐21. - PubMed
    1. Roye CF, Hudson M. Developing a culturally appropriate video to promote dual‐method use by urban teens: rationale and methodology. AIDS Education and Prevention 2003;15:148‐58. - PubMed
Stanton 1996 {published data only}
    1. Galbraith J, Ricardo I, Stanton B, Black M, Feigelman S, Kaljee L. Challenges and rewards of involving community in research: an overview of the "Focus on Kids" HIV Risk Reduction Program. Health Education Quarterly 1996;23(3):383‐94. - PubMed
    1. Stanton BF, Li X, Galbraith J, Feigelman S, Kaljee L. Sexually transmitted diseases, human immunodeficiency virus, and pregnancy prevention. Combined contraceptive practices among urban African‐American early adolescents. Archives of Pediatric and Adolescent Medicine 1996;150(1):17‐24. - PubMed
    1. Stanton BF, Li X, Ricardo I, Galbraith J, Feigelman S, Kaljee L. A randomized, controlled effectiveness trial of an AIDS prevention program for low‐income African‐American youths. Archies of Pediatric and Adolescent Medicine 1996;150(4):363‐72. - PubMed
Stephenson 2004 {published data only}
    1. Stephenson JM, Strange V, Forrest S, Oakley A, Copas A, Allen E, et al. Pupil‐led sex education in England (RIPPLE study): cluster‐randomised intervention trial. Lancet 2004;364(9431):338‐46. - PubMed
Stephenson 2011 {published data only}
    1. Stephenson R, Vwalika B, Greenberg L, Ahmed Y, Vwalika C, Chomba E, et al. A randomized controlled trial to promote long‐term contraceptive use among HIV‐serodiscordant and concordant positive couples in Zambia. Journal of Women's Health. 2011/03/18 2011; Vol. 20, issue 4:567‐74. - PMC - PubMed
    1. Wall KM, Vwalika B, Haddad L, Khu NH, Vwalika C, Kilembe W, et al. Impact of long‐term contraceptive promotion on incident pregnancy: a randomized controlled trial among HIV‐positive couples in Lusaka, Zambia. Journal of Acquired Immune Deficiency Syndrome. 2012/12/04 2013; Vol. 63, issue 1:86‐95. - PMC - PubMed
Ullman 1996 {published data only}
    1. Ullman R, Lathrop L. Impact of free condom distribution on the use of dual protection against pregnancy and sexually transmitted disease. Canadian Journal of Human Sexuality 1996;5(1):25‐9. - PubMed
Walker 2006 {published data only}
    1. Walker D, Gutierrez JP, Torres P, Bertozzi SM. HIV prevention in Mexican schools: prospective randomised evaluation of intervention. BMJ 2006;332(7551):1189‐94. - PMC - PubMed
Wang 2005 {published data only}
    1. Wang B, Hertog S, Meier A, Lou C, Gao E. The potential of comprehensive sex education in China: findings from suburban Shanghai. International Family Planning Perspectives 2005;31(2):63‐72. - PubMed
Wight 2002 {published data only}
    1. Henderson M, Wight D, Raab GM, Abraham C, Parkes A, Scott S, et al. Impact of a theoretically based sex education programme (SHARE) delivered by teachers on NHS registered conceptions and terminations: final results of cluster randomised trial. British Medical Journal 2006;334(7585):133. - PMC - PubMed
    1. Wight D, Raab GM, Henderson M, Abraham C, Buston K, Hart G, et al. Limits of teacher delivered sex education: interim behavioural outcomes from randomised trial. British Medical Journal 2002;324(7351):1430. - PMC - PubMed
Zimmerman 2008 {published data only}
    1. Zimmerman RS, Cupp PK, Donohew L, Sionean CK, Feist‐Price S, Helme D. Effects of a school‐based, theory‐driven HIV and pregnancy prevention curriculum. Perspectives on Sexual and Reproductive Health. 2008/03/06 2008; Vol. 40, issue 1:42‐51. - PubMed

References to ongoing studies

Shegog 2013 {published data only}
    1. Shegog R. Internet‐based Sexual Health Education for Middle School Native American Youth (IYG‐AI/AN). www.clinicaltrials.gov/show/NCT01303575‎ (accessed 17 Oct 2013). [NCT01303575‎]

Additional references

Balshem 2011
    1. Balshem H, Helfand M, Schünemann HJ, Oxman AD, Kunz R, Brozek J, et al. GRADE guidelines: 3. Rating the quality of evidence. Journal of Clinical Epidemiology 2011;64(4):401‐6. - PubMed
Blank 2010
    1. Blank L, Baxter SK, Payne N, Guillaume LR, Pilgrim H. Systematic review and narrative synthesis of the effectiveness of contraceptive service interventions for young people, delivered in educational settings. Journal of Pediatric and Adolescent Gynecology 2010;23(6):341‐51. - PubMed
Blank 2012
    1. Blank L, Baxter SK, Payne N, Guillaume LR, Squires H. Systematic review and narrative synthesis of the effectiveness of contraceptive service interventions for young people, delivered in health care settings. Health Education Research 2012;27(6):1102‐19. - PubMed
Borrelli 2011
    1. Borrelli B. The assessment, monitoring, and enhancement of treatment fidelity in public health clinical trials. Journal of Public Health Dentistry. 2011/04/19 2011; Vol. 71, issue s1:S52‐63. - PMC - PubMed
Brown 2011
    1. Brown JL, Hennessy M, Sales JM, DiClemente RJ, Salazar LF, Vanable PA, et al. Multiple method contraception use among African American adolescents in four US cities. Infectious Diseases in Obstetrics and Gynecology 2011;Jul 18(Epub):765917. - PMC - PubMed
Carvalho 2011
    1. Carvalho FT, Goncalves TR, Faria ER, Shoveller JA, Piccinini CA, Ramos MC, et al. Behavioral interventions to promote condom use among women living with HIV. Cochrane Database of Systematic Reviews 2011, Issue 9. [DOI: 10.1002/14651858.CD007844.pub2] - DOI - PMC - PubMed
Cates 2002
    1. Cates W Jr, Steiner M J. Dual protection against unintended pregnancy and sexually transmitted infections: what is the best contraceptive approach?. Sexually Transmitted Diseases 2002;29(3):168‐74. - PubMed
CDC 2010
    1. Centers for Disease Control and Prevention. 2010 STD Treatment Guidelines. http://www.cdc.gov/std/treatment/2010/default.htm (accessed 14 Mar 2013).
CDC 2011a
    1. Centers for Disease Control and Prevention. Trends in the prevalence of sexual behaviors and HIV testing National YRBS: 1991–2011. http://www.cdc.gov/healthyyouth/yrbs/pdf/us_sexual_trend_yrbs.pdf (accessed 28 Sep 2013).
CDC 2011b
    1. Centers for Disease Control and Prevention. STD Trends in the United States. 2011 National data for chlamydia, gonorrhea, and syphilis. http://www.cdc.gov/std/stats11/trends‐2011.pdf (accessed 02 Oct 2013).
Chapman 2012
    1. Chapman S, Jafa K, Longfield K, Vielot N, Buszin J, Ngamkitpaiboon L, et al. Condom social marketing in sub‐Saharan Africa and the Total Market Approach. Sexual Health 2012;9(1):44‐50. - PubMed
Chin 2012
    1. Chin HB, Sipe TA, Elder R, Mercer SL, Chattopadhyay SK, Jacob V, et al. The effectiveness of group‐based comprehensive risk‐reduction and abstinence education interventions to prevent or reduce the risk of adolescent pregnancy, human immunodeficiency virus, and sexually transmitted infections. American Journal of Preventive Medicine 2012;42(3):272‐94. - PubMed
Crosby 2012
    1. Crosby R, Bounse S. Condom effectiveness: where are we now?. Sexual Health 2012;9(1):10‐7. - PubMed
Eisenberg 2012
    1. Eisenberg DL, Allsworth JE, Zhao Q, Peipert JF. Correlates of dual‐method contraceptive use: an analysis of the National Survey Of Family Growth (2006‐2008). Infectious Diseases in Obstetrics and Gynecology 2012;Apr 17(Epub):717163. - PMC - PubMed
Friend 2010
    1. Friend D R, Doncel G F. Combining prevention of HIV‐1, other sexually transmitted infections and unintended pregnancies: Development of dual‐protection technologies. Antiviral Research 2010;88 Suppl 1:S47‐54. - PubMed
Gallo 2013
    1. Gallo MF, Steiner MJ, Hobbs MM, Warner L, Jamieson DJ, Macaluso M. Biological markers of sexual activity: tools for improving measurement in HIV/sexually transmitted infection prevention research. Sexually Transmitted Diseases. 2013/05/17 2013; Vol. 40, issue 6:447‐52. - PMC - PubMed
Godeau 2008
    1. Godeau E, Nic Gabhainn S, Vignes C, Ross J, Boyce W, Todd J. Contraceptive use by 15‐year‐old students at their last sexual intercourse: results from 24 countries. Archives of Pediatrics & Adolescent Medicine 2008;162(1):66‐73. - PubMed
Guyatt 2011
    1. Guyatt G, Oxman AD, Akl EA, Kunz R, Vist G, Brozek J, et al. GRADE guidelines: 1. Introduction‐GRADE evidence profiles and summary of findings tables. Journal of Clinical Epidemiology 2011;64(4):383‐94. - PubMed
Halpern 2013
    1. Halpern V, Lopez LM, Grimes DA, Gallo MF. Strategies to improve adherence and acceptability of hormonal methods of contraception. Cochrane Database of Systematic Reviews 2013, Issue 10. [DOI: 10.1002/14651858.CD004317.pub4] - DOI - PubMed
Higgins 2011
    1. Higgins JPT, Green S (editors). Cochrane Handbook for Systematic Reviews of Interventions 5.1.0 [updated March 2011]. The Cochrane Collaboration, 2011. Available from www.cochrane‐handbook.org. John Wiley & Sons, Ltd, (accessed 26 Mar 2012).
Higgins 2012
    1. Higgins JA, Cooper AD. Dual use of condoms and contraceptives in the USA. Sexual Health 2012;9(1):73‐80. - PubMed
Kleinschmidt 2003
    1. Kleinschmidt I, Maggwa BN, Smit J, Beksinska ME, Rees H. Dual protection in sexually active women. South African Medical Journal. 2003/12/18 2003; Vol. 93, issue 11:854‐7. - PubMed
Lopez 2013a
    1. Lopez LM, Otterness C, Chen M, Steiner M, Gallo MF. Behavioral interventions for improving condom use for dual protection. Cochrane Database of Systematic Reviews 2013, Issue 7. [DOI: 10.1002/14651858.CD010662] - DOI - PMC - PubMed
Lopez 2013b
    1. Lopez LM, Tolley EE, Grimes DA, Chen M. Theory‐based interventions for contraception. Cochrane Database of Systematic Reviews 2013, Issue 8. [DOI: 10.1002/14651858.CD007249.pub4] - DOI - PubMed
Martin 2010
    1. Martin JA, Hamilton BE, Sutton PD, Ventura SJ, Matthews TJ, Osterman MJK. Births: Final data for 2008. National vital statistics reports. Vol. 59(1), Hyattsville, MD (USA): National Center for Health Statistics, 2010. - PubMed
Meader 2013
    1. Meader N, Semaan S, Halton M, Bhatti H, Chan M, Llewellyn A, et al. An international systematic review and meta‐analysis of multisession psychosocial interventions compared with educational or minimal interventions on the HIV sex risk behaviors of people Who use drugs. AIDS and Behavior 2013;17(6):1963‐78. - PubMed
Medley 2009
    1. Medley A, Kennedy C, O'Reilly K, Sweat M. Effectiveness of peer education interventions for HIV prevention in developing countries: a systematic review and meta‐analysis. AIDS Education and Prevention 2009;21(3):181‐206. - PMC - PubMed
Mosher 2012
    1. Mosher WD, Jones J, Abma JC. Intended and unintended births in the United States: 1982‐2010. National Center for Health Statistics reports; no 55. Hyattsville, MD (USA): National Center for Health Statistics, 2012. - PubMed
O'Leary 2011
    1. O'Leary A. Are dual‐method messages undermining STI/HIV prevention?. Infectious Diseases in Obstetrics and Gynecology 2011;Dec 07(Epub):691210. - PMC - PubMed
Pack 2011
    1. Pack R P, Li X, Stanton B F, Cottrell L A. Psychosocial correlates of dual methods for contraception and STI protection in urban adolescents. ISRN Obstetrics and Gynecology 2011;Oct 29(Epub):469610. [DOI: 10.5402/2011/469610] - DOI - PMC - PubMed
Parr 2007
    1. Parr N, Siedlecky S. Use of 'dual protection' and other combinations of contraceptive methods in Australia. Australian and New Zealand Journal of Public Health 2007;31(6):567‐70. - PubMed
Picot 2012
    1. Picot J, Shepherd J, Kavanagh J, Cooper K, Harden A, Barnett‐Page E, et al. Behavioural interventions for the prevention of sexually transmitted infections in young people aged 13‐19 years: a systematic review. Health Education Research 2012;27(3):495‐512. - PubMed
Schulz 2002
    1. Schulz KF, Grimes DA. Allocation concealment in randomised trials: defending against deciphering. Lancet 2002;359(9306):614‐8. - PubMed
Sitruk‐Ware 2013
    1. Sitruk‐Ware R, Nath A, Mishell DR. Contraception technology: past, present and future. Contraception 2013;87(3):319‐30. - PMC - PubMed
Steiner 1999
    1. Steiner MJ, Cates W, Warner L. The real problem with male condoms is nonuse. Sexually Transmitted Diseases 1999;26(8):459‐52. - PubMed
Strauss 2005
    1. Strauss SE, Richardson WS, Glasziou P, Haynes RB. Evidence‐based Medicine: How to Practice and Teach EBM. Third Edition. New York: Churchill Livingstone, 2005.
Sweat 2012
    1. Sweat M D, Denison J, Kennedy C, Tedrow V, O'Reilly K. Effects of condom social marketing on condom use in developing countries: a systematic review and meta‐analysis, 1990‐2010. Bulletin of the World Health Organization 2012;90(8):613‐222A. - PMC - PubMed
Thurman 2011
    1. Thurman A R, Clark M R, Doncel G F. Multipurpose prevention technologies: biomedical tools to prevent HIV‐1, HSV‐2, and unintended pregnancies. Infectious Diseases in Obstetrics and Gynecology 2011;Aug 13(Epub):429403. - PMC - PubMed
Trussell 2011
    1. Trussell J. Contraceptive failure in the United States. Contraception 2011;83(5):397‐404. - PMC - PubMed
USAID 2005
    1. United States Agency for International Development. USAID: HIV/STI Prevention and Condoms. May 2005. http://transition.usaid.gov/our_work/global_health/aids/TechAreas/preven... (accessed 03 Apr 2013).
Warner 2012
    1. Warner L, Gallo M F, Macaluso M. Condom use around the globe: how can we fulfil the prevention potential of male condoms?. Sexual Health 2012;9(1):4‐9. - PubMed
Wells 2013
    1. GA Wells, Shea B, O'Connell D, Peterson J, Welch V, Losos M, Tugwell P. The Newcastle‐Ottawa Scale (NOS) for assessing the quality of nonrandomised studies in meta‐analyses. http://www.ohri.ca/programs/clinical_epidemiology/oxford.asp (accessed 26 Mar 2013).
WHO 2013a
    1. World Health Organization. Family Planning Fact Sheet No. 351. http://www.who.int/mediacentre/factsheets/fs351/en/ (accessed 10 Oct 2013).
WHO 2013b
    1. World Health Organization. HIV/AIDS and other STIs: Data on the size of the HIV/AIDS epidemic. http://apps.who.int/gho/data/node.main.618?lang=en (accessed 10 Oct 2013).
Winner 2012
    1. Winner B, Peipert JF, Zhao Q, Buckel C, Madden T, Allsworth JE, et al. Effectiveness of long‐acting reversible contraception. New England Journal of Medicine 2012;366(21):1998‐2007. - PubMed

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