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Uptake of hormonal contraceptives and correlates of uptake in a phase III clinical trial in rural South Western Uganda



Use of a reliable contraception method has become an inclusion criterion in prevention trials to minimize time off product. We report on hormonal contraceptive prevalence, uptake, sustained use and correlates of use in the Microbicides Development Programme (MDP 301) trial at the Masaka Centre in Uganda.


HIV negative women in sero-discordant relationships were enrolled and followed-up for 52 to 104 weeks from 2005 to 2009. Contraceptive use data was collected through self-report at baseline and dispensing records during follow-up. Hormonal contraceptives were promoted and provided to women that were not using a reliable method at enrolment. Baseline contraceptive prevalence, uptake and sustained use were calculated. Uptake was defined as a participant who reported not using a reliable method at enrolment and started using a hormonal method at any time after. Logistic regression models were fitted to investigate predictors of hormonal contraceptive uptake.


A total of 840 women were enrolled of whom 21 aged ≥50 years and 12 without follow-up data were excluded; leaving 807 (median age 31 IQR 26–38) in this analysis. At baseline, 228 (28%) reported using a reliable contraceptive; 197 hormonal, 28 female-sterilisation, two IUCD and one hysterectomy. As such 579 were not using a reliable contraceptive at enrolment, of whom 296 (51%) subsequently started using a hormonal contraceptive method; 253 DMPA, four oral pills, and two norplant. Overall 193 (98%) existing users and 262 (88%) new users sustained use throughout follow-up. Independent correlates of hormonal contraceptive uptake were: younger women ≤30 years, aOR = 2.5, 95% CI: 1.7–3.6 and reporting not using contraceptives at baseline due to lack of access or money, breastfeeding or other reasons, in comparison to women who reported using unreliable method.


Promotion and provision of hormonal contraception doubled the proportion of women using a reliable method of contraception. Uptake was pronounced among younger women and those not previously using a reliable method because of lack of access or money, and breastfeeding. Promotion and provision of hormonal contraceptives in trials that require the interruption or discontinuation of investigational products during pregnancy is important to reduce the time off product.

Trial registration

Protocol Number ISRCTN64716212.

Peer Review reports

Plain English Summary

The use of reliable contraceptives is increasingly being added as an inclusion criterion in HIV prevention trials. Studies have not reported on the uptake of reliable contraceptives after enrolment among women participating in large phase III microbicide clinical trials to inform future trials. In this article we determined uptake of hormonal contraceptives and its correlates in a phase III vaginal microbicide trial.

Hormonal contraceptives (pill, injectable Depot medroxyprogesterone acetate (DMPA) and Norplant or intrauterine contraceptive device (IUCD)) were promoted and provided to women that were not using a reliable method at enrolment into the trial and during follow up.

Data on 807 women were analysed and 579 were not using a reliable contraceptive method at enrolment, of which 296 started using a hormonal contraceptive method mainly DMPA (253).

Promotion and provision of hormonal contraceptives substantially improved uptake of these methods. The uptake was particularly highest among younger women and among women who couldn’t or didn’t think they needed to access contraceptives. This evidence highlights the benefit of promoting and providing hormonal contraceptives to trial participants where pregnancy could disrupt the use of investigational products.


In 2014 it was estimated that only 28% [1] of women in Africa and 17% [2] in Sub-Saharan Africa were using modern methods of contraception (injectable, norplant, intrauterine contraceptive device (IUCD), pill, diaphragm, male condom and sterilization). In Uganda, modern contraceptive use among women of reproductive age increased from 18% in 2006 [3] to 32% in 2011 [4]. The proportion using modern methods is lower than that reported in neighbouring Kenya (39%) and Rwanda (45%), similar to Tanzania (26%) but higher than Burundi (18%) in 2011 [5]. Generally, the use of modern contraceptives in Uganda is lower among women aged 25 years or less (20%), married (26%), or those living in rural areas (23%) [3] [6]. The unmet need for any contraceptives in Uganda remains high at 41% especially among women who are currently married, living in rural areas and living in the Northern region [7]. In 2011, the total fertility rate among women of reproductive age in Uganda was estimated to be 6.2 and as a consequence the country’s population is expected to double over the next 20 years [5]. Addressing the unmet contraceptive needs of Ugandan women is critical for couples to limit or space births [8].

In addition, the need for female initiated and controlled HIV preventive options remains high. In 2011, the HIV prevalence among women of reproductive age in Uganda was 8% [9] and incidence of approximately 1% [10]. Contraceptive use among sero-discordant couples is low 23% [11] and similar to the national average among married women in general [12]. Similarly, condom use among sero-discordant couples is equally low (36%) [11]. Dual contraceptive use (condoms plus a modern contraceptive) among HIV positive women of reproductive age attending urban clinics is not good either 12%, with 42% of HIV-positive pregnant women reporting their pregnancy to be unintended [13]. Overall, condom use with a spouse or partner is low among men (6%) and women (4%) [14]. However, condom use while having sex with causal sexual partners has increased and it is still more likely among men than women [14].

A number of clinical trials evaluating new HIV prevention technologies including vaginal microbicides and oral pre-exposure prophylaxis (PrEP) have been conducted in Uganda [1519]. These trials are powered to provide sufficient sample sizes to assess the efficacy of investigational products. Given the unknown effects of the investigational products on the unborn foetus, product use is usually interrupted or discontinued during pregnancy. A higher than anticipated pregnancy incidence may affect the statistical power of a trial to detect the efficacy of a product. Limiting the risk of unintended pregnancies in clinical trials by supporting women’s use of reliable contraceptives (injectable, norplant, pill, IUCD and female sterilisation) helps to avoid a loss of statistical power. The use of reliable contraceptives is increasingly being added as an inclusion criterion in HIV prevention trials [20]. The use of contraceptives at time of enrolment in later stage microbicide clinical trials has ranged from 10% in Nigeria [21] to 56% in Uganda [15] and South Africa [22]. The baseline use of hormonal (injectable, norplant and pills) contraceptives has ranged from 9% in Nigeria [21] to 15% in Ghana [23]. To date, studies have not reported on the uptake of reliable contraceptives after enrolment among women participating in large phase III microbicide clinical trials. Microbicide trials enrol women who are not intending to get pregnant during the course of the trial, yet pregnancy rates in efficacy trials have ranged from 1 to 27 per 100 women-years [24].

In this analysis we report on the baseline contraceptive use, correlates of hormonal contraceptive uptake after enrolment, and the sustained use of hormonal contraceptives during follow-up among women in sero-discordant couple sexual relationship enrolled in the Microbicides Development Programme (MDP 301) clinical trial in South-Western Uganda.


MDP301 was an international, randomized, double-blind, placebo-controlled parallel-group phase III clinical trial, designed to evaluate the safety and efficacy of 0.5% and 2% PRO2000 candidate microbicide gels in preventing vaginally acquired HIV-1 infection. The trial design and trial results have been reported elsewhere [15, 25, 26]. In summary, participants were enrolled at 13 clinics across six research centres, three in South Africa and one each in Tanzania, Uganda and Zambia. This analysis is based on MDP301 data collected exclusively at the Masaka clinic research centre in South-Western Uganda.

The MDP301 Masaka clinical trial centre enrolled HIV-negative healthy women in a known HIV sero-discordant relationship and followed them for a minimum of 52 weeks and a maximum of 104 weeks. Women in sero-discordant relationships were identified and enrolled following a sero-survey conducted between September 2005 and August 2008. Follow-up continued until September 2009. The eligibility criteria are in Table 1.

Table 1 MDP 301 Uganda: eligibility criteria

Details of the clinical, laboratory and pharmacy procedures, data management, field activities, counselling package and follow-up schedules are described elsewhere [15, 2527]. Women were randomised to one of the three gel groups; 0.5% PRO2000, 2% PRO2000 or placebo. Screening visits occurred no more than 6 weeks prior to enrolment, and follow-up visits were scheduled every four weeks after enrolment and conducted at either the research clinic or designated government health centres. At screening, data were collected on demographic and behavioural characteristics. The following variables were considered in this analysis: age, religion, education level, employment status, method of contraceptives used and reason for non-use. Behavioural data were collected at the four weekly follow-up visits, including data on gel and condom use at the last sex act. Extended behavioural data were collected at the longer clinical examination visits, which occurred at weeks 4, 12, 24, 40, 52, 64, 76, 88, 100 and 104 after enrolment. Contraceptive use data were collected at every visit. Women were asked whether they were using any contraceptive method, if they were, a single method was captured which could include unreliable methods such as condoms, the rhythm method, withdrawal or traditional remedies. If they reported not using a contraceptive method, a single reason for none-use was captured which could include wanting to become pregnant, the partner being sterilised, or currently breastfeeding (locally considered a period of infertility). However, women who reported using an unreliable method were not asked why they were not using a reliable method.

The research team offered contraceptive services at every visit, which included the provision of the oral contraceptive pill and injectable Depot medroxyprogesterone acetate (DMPA). The study clinic referred women who chose to use the norplant or intrauterine contraceptive device (IUCD) to the Marie Stopes clinic located about one km from the study clinic. Women were given contraceptive cards, which captured the woman’s contraceptive use history and future prescription renewal dates. They were asked to bring their contraceptive cards at every visit. At each four-weekly follow-up visit we conducted rapid urine pregnancy tests and interrupted gel if the woman tested positive for pregnancy. The study provided transport expenses to and from the study clinic.

Enrolled women ranged in age from 16 to 59 years old. Only women of reproductive age between 16 and 49 years were included in this analysis. We further excluded women that did not have any follow-up data. We defined reliable contraceptives as non-barrier methods likely to significantly reduce the risk of pregnancy and categorised the following contraceptive methods as reliable: female sterilisation, pill, DMPA, Norplant and IUCD. We included the one woman who had had a hysterectomy in the group defined as using reliable contraceptive methods. We categorised condoms, the rhythm method, withdrawal, traditional remedies, breastfeeding or no method as ‘not reliable’. We did not classify condom use as a reliable method of contraception because in this community only male condom is readily and freely available and its use is largely male controlled. Women who were not using a reliable contraceptive at baseline were encouraged to use hormonal methods (pill, DMPA, or Norplant). We categorised ‘new’ hormonal contraceptive users as any women who reported not using a reliable contraceptive method at the enrolment visit and reported using a hormonal method during at least one follow-up visit.

Statistical methods

The analysis was separated into three parts, first comparing women who reported using a reliable contraceptive method at enrolment to women who reported not using a reliable method. Secondly, women who started using a hormonal method after enrolment (new users) were compared to those that did not switch to a hormonal method (non-adopters) during the trial. Lastly, hormonal users that sustained use of the initial method overtime were compared to those that switched between hormonal methods after initiation. We defined sustained use of a hormonal method as a woman taking up a hormonal method and using it throughout the study follow up period.

Descriptive statistics were used to summarise women’s characteristics. The proportion of women using hormonal contraceptive was estimated as the number using hormonal contraceptives divided by the number of women attending the visit. We examined associations between women using reliable and those not using reliable contraceptives at baseline, and between women who started and sustained use of a hormonal method to those that switched between hormonal methods using chi-square. The associations between new hormonal contraceptive users and non-adopters during follow up were assessed using odds ratios, with 95% confidence intervals (CI), and by fitting logistic regression models. Only factors for which the association attained a statistical significance at the 15% [28] level using a likelihood ratio test (LRT) in a univariable analysis were considered for the multivariable model. In the multivariable model, factors were removed from the model using a backward elimination algorithm if removing the term did not make the fit of the model significantly worse at the 5% level on a likelihood ratio test (LRT). All analyses were conducted using Stata 11 (StataCorp, College Station, Texas, USA).


A total of 1,161 women were screened and 840 (72.4%) enrolled in Uganda. The main reasons for ineligibility were HIV-positive status (111), pregnancy (51), not being sexually active (18), clinical findings making enrolment inadvisable (5), being unlikely to comply with the protocol (4) or likely to have sex more than 14 times per week (1) Fig. 1. An additional 131 women were eligible at screening but chose not to enrol in the study. Of the 840 women enrolled, 33 were excluded from this analysis, 21 women aged 50 or above and 12 women that did not have any follow up data. This left 807 women for analysis. The median age of women included in the analyses was 31 years (inter-quartile range IQR: 26–38).

Fig. 1
figure 1

Masaka Centre study profile

Contraceptive use at baseline

At baseline, 228 women (28.2%) reported using a reliable contraceptive method. A further 245 women (30.4%) reported using an unreliable contraceptive method, mainly condoms (215), the natural rhythm method (15), traditional oral methods (14) and withdrawal (1); 334 women (41.4%) reported not using any method of contraception.

Of the 228 women using a reliable contraceptive method, 197 (24.4% of the 807 women) reported using hormonal contraceptives (161 using DMPA, 33 using the oral pill and 3 using Norplant), 28 (3.5%) were sterilised, two (0.2%) were using the IUCD, and one (0.1%) had had a total hysterectomy. The only factor significantly associated with use of a reliable contraceptive method at enrolment was employment status with women who were in full time employment or who were housewives being more likely to use reliable contraception than unemployed women (Table 2).

Table 2 Baseline characteristics of reliable contraceptive users

Uptake of hormonal contraceptives

Table 3 presents the characteristics of the 579 women who were not using a reliable method of contraception at baseline. The median age was 31 (IQR: 26–38) with 51.4% being more than 30 years old. The majority were Christian (86.9%), had attained only primary education (67.9%) and were unemployed (73.3%).

Table 3 Factors associated with uptake of hormonal contraceptive methods in multivariable model

As shown in Table 3, 296 (51.1%) women were defined as ‘new’ hormonal contraceptive users in terms of not using a reliable method at baseline and reporting use of a hormonal method during at least one follow-up visit. Of the new hormonal contraceptive users, 253 (85.5%) women started using DMPA, 41 (13.9%) oral pill and two (<1%) norplant. About two-thirds of new hormonal contraceptive users had reported not using any contraceptive method at enrolment (204; 68.9%), and the remainder had either switched from or supplemented condom use (85; 28.7%) or reported using another unreliable method (7; 2.4%). Figure 2 shows the proportion of women reporting hormonal contraceptive use at each of the extended behavioural visits throughout the trial. The graph illustrates that the majority of new hormonal contraceptive users started use within the first three months of follow-up and that hormonal contraceptive use was consistently over 50% from the six-month visit onwards.

Fig. 2
figure 2

Proportion of women reporting use of hormonal contraception over time

Of the 283 women who did not start using a hormonal method of contraception, 8 opted for other reliable methods such as sterilisation (5) and the IUCD (3), while 250 women continued to report unreliable contraceptive methods such as condoms (242), and the natural rhythm method or withdrawal (8). Only twenty-five women never reported using any contraceptive method.

At enrolment, only 144 of the 807 (17.8%) women who had had sex in the previous 4 weeks reported dual use of a condom and a reliable contraceptive method at their last sex act. Of the 579 non-hormonal contraceptive users at baseline, 367 (63.4%) reported using a condom at their last sex act. Of the 296 new hormonal contraceptive users, 208 (70.3%) reported the use of a condom at the last sex act at every visit compared to 221/283 (78.1%) among the women who did not start using hormonal contraceptives.

Among women who reported not using any contraceptive method at enrolment, the main reasons included 141 (42.2%) reporting they were currently breast-feeding (perceived locally to prevent conception), 77 (23.0%) assumed they were infertile after at least 2 years of not conceiving, 60 (18.0%) had previous experience of side effects or a fear of using contraceptives, 31 (9.3%) reported lack of access or money for contraceptives, as well as 25 (7.5%) women reporting other reasons such as partner opposition or refusal, getting tired of using contraceptives and their partner wanting a child.

As shown in Table 3, factors that were significantly associated with hormonal contraceptive uptake at the 15% level in univariable analysis included age, religion, employment status, reported unreliable method of family planning at baseline, and reasons for not using a reliable method of contraception at baseline. After controlling for all factors in multivariable analysis, younger women (≤30 years) were more than twice as likely to have started using hormonal contraceptives, than older women (>30). Women were also significantly more likely to start using hormonal contraceptives if they had reported not using contraceptives at baseline due to a lack of access or money, breastfeeding or other reasons, compared to those who reported the use of other unreliable contraceptive methods.

Sustained hormonal contraceptive use

Of the 296 new hormonal contraceptive users, 262 (88.5%) sustained use of the new hormonal method throughout the remainder of their follow-up. Most women reported use of hormonal methods for a median of 6 times (IQR 4–7) after initiation until end of follow-up. The remaining 34 (11.5%) switched between hormonal methods, with 29 starting on DMPA but switching to the oral pill, four starting on DMPA and switching to Norplant, and one starting with the oral pill and switching to Norplant. Women indicated bleeding as the main reason for switching from DMPA. After initiating hormonal contraceptive use, none of the 296 new contraceptive users reported not using hormonal contraceptives at a subsequent visit up to the end of their follow-up. There were no statistically significant differences between women who sustained the initial hormonal contraceptive method and those that switched methods in terms of age, religion, employment status or educational level (data not shown). Of the 197 women already using hormonal contraceptives at baseline, 193 (98.0%) sustained use of a hormonal method throughout follow-up.


In this study, we assessed contraceptive prevalence, uptake and sustained use among women enrolled in an HIV prevention trial in Masaka, who were in sero-discordant relationships. The baseline prevalence of reliable contraceptive use was low and similar to the national 2011 average among women of reproductive age in Uganda [3]. The specific use of hormonal contraceptives at baseline in this cohort was similar to the overall rate in the central region of Uganda [3] where the study was conducted. Contraceptive prevalence is consistently higher in Central and Western regions of Uganda [3] in comparison to the Northern and Eastern regions. A number of factors have been previously advanced for geographical variations in contraceptive use prevalence including community level cultural beliefs (such as value attached to children), the presence and quality of reproductive health services and accessibility in terms of transport routes [29]. The Northern and Eastern regions of Uganda were affected by a civil war for over two decades and this contributed to the breakdown of social services and community coping mechanisms [29].

In this study, the majority of women reporting reliable contraceptive use at baseline used DMPA, which is consistent with both national data and data from the central region of Uganda [3]. It was encouraging that contraceptive prevalence did not differ by age, educational status or religion. Nationally both younger age and lower educational status are associated with lower contraceptive use [3]. In this cohort unemployed women were significantly less likely to use contraceptives at baseline. In the national data, employment status is not reported yet women in the lowest wealth quintile had the lowest contraceptive prevalence [3], which is likely to explain the association observed with unemployment in our study.

The most striking finding from this study was that over half of all women who were not using reliable contraceptives at baseline started using hormonal contraceptives, mainly within the initial three months of the study. Uptake was significantly higher among younger women. Although our results do not suggest a significant age differentiation between women’s use of contraceptives at baseline, the uptake data suggests a substantial unmet need among this younger age group. The reasons that women reported for not using a reliable method of contraception at baseline were independently associated with hormonal contraceptives uptake. Women who reported a lack of access or a lack of money as being the main reason for non-use were over six times more likely to initiate hormonal contraceptive use than women using an unreliable method at baseline. Although contraceptives are freely available in Uganda, distance from health centres has been documented as a structural barrier to health services in Sub-Saharan Africa, including Uganda [30, 31]. This association between lack of access and low usage has been observed elsewhere in Uganda and Kenya [32, 33]. This finding, along with the correlation of lower use among unemployed women, highlights the need for either financial support for lower income women to be able to travel to existing health centres or for the expanded provision of more accessible family planning services.

In Uganda, and elsewhere, it is often believed that women cannot conceive when breastfeeding. Women who reported not using contraceptives at baseline due to breastfeeding were five-times more likely to initiate use during the study. This association has been observed in other parts of Africa [34] and highlights the need to disseminate accurate information about contraception and the need for better contraceptive messages and provision in ante-natal care settings [35].

Other reasons for non-contraceptive use reported at baseline such as partner opposition or refusal, women getting tired of using contraceptives and partners wanting a child, were also associated with high uptake of hormonal contraceptives during follow-up, although the numbers were low. In the Masaka centre we enrolled couples together and regularly provided couple counselling. Evidence from this centre suggests that generally couples jointly decided on use of the trial gel and women reported feeling supported by their partners to use the gel [36]. This evidence suggests that joint decision making or partner support could be an influencing factor in improving usage of hormonal contraceptives as well as gel.

It was encouraging to see very high levels of sustained use of hormonal methods among both women who reported using them at baseline and among new users. Uptake and sustained use was high in this cohort, and given the baseline contraceptive prevalence was similar to the local prevalence, it is likely that the study clinic filled a gap of provision in this community. However it is also likely that participation in the trial specifically motivated women to start and continue to use contraceptives. There is limited evidence on adherence and reasons for interruption and discontinuation, and further qualitative research is needed to help support appropriate uptake and sustained use in health care settings.

This study highlights the importance of offering hormonal contraceptives as a standard of care in clinical trials in order to reduce the risk of pregnancies requiring time off investigational product. This benefit has been illustrated in other HIV prevention trials as well [23, 37] However, there are concerns about the association between the use of hormonal contraceptives and an increased risk of HIV as observed in some studies [3842] but not others [4346]. Currently, the risks of withdrawing hormonal contraceptives outweigh the benefits in relation to increased risk of unwanted pregnancies and pregnancy complications [4750]. The World Health Organisation has recommended continued use of hormonal methods until conclusive evidence of risk is available, with increased counselling for dual protection with condoms [51].

It was concerning to note that dual use of condoms and a reliable contraceptive method was very low at baseline among this cohort of HIV-negative women in sero-discordant relationships reportedly not wanting to get pregnant. However, baseline condom use for HIV prevention at the last sex act was high at 63%. Of particular importance is the fact that the increased uptake of hormonal contraception did not negatively impact on condom use, demonstrating the potential to improve dual method use. More effort is needed to promote dual contraceptive use especially in light of the World Health Organization (WHO) guidelines [51] recommending condom use along with hormonal methods to prevent possible increased risk of HIV acquisition.

Some of the limitations of this analysis are; we did not collect data on marital status, partner attitudes to contraceptive use, parity and area of residence all of which have been associated with contraceptive preference and use [3, 51, 52]. Furthermore, we did not collect data on the reasons for non-contraceptive use during follow up amidst free provision of contraceptives. Collection of such data could help inform future strategies aimed at improving contraceptive use during follow up.

The major strength of this study is that we assessed uptake in a study that provided contraceptives and where women were counselled on both the use and importance of adherence to dual contraceptive use. The contraceptive use data were collected by two independent investigators and cross checked at each visit.


In a study with baseline contraceptive use similar to the general population, we saw a substantial uptake of hormonal contraceptives. The uptake of hormonal contraceptives did not displace the high use of condoms among sero-discordant couples, demonstrating the potential to improve the use of dual methods. The uptake was particularly pronounced among younger women and among women who couldn’t or didn’t think they needed to access contraceptives. The rate of sustained use was exceptionally high in a study with up to two years follow-up. This evidence highlights the benefit of promoting and providing hormonal contraceptives to trial participants where pregnancy could disrupt the use of investigational products. While contraceptive use has improved in Uganda, only a quarter of women of reproductive age report usage, unmet need remains high and dual method use low. As such this study also highlights the opportunities by which health care providers could fill gaps in provision including expanding access to low income and younger women, and enhancing accurate contraceptive messaging.



Acquired Immunodeficiency Syndrome


Adjusted Odds Ratio


Confidence Interval


UK Department for International Development


Depot Medroxyprogesterone Acetate


Human Immunodeficiency Virus


Interquartile Range


Intrauterine Contraceptive Device


Likelihood Ratio Test


Microbicides Development Programme


Medical Research Council


Pre-Exposure Prophylaxis


United Kingdom


Unadjusted Odds Ratio


Uganda Virus Research Institute


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We would like to acknowledge the study participants and their partners, the Masaka community advisory board, and the MDP 301 research team. We acknowledge the British Government’s Department for International Development (DfID) and the UK Medical Research Council for funding the study and Endo Pharmaceuticals Solutions for donating the study gels.


Endo Pharmaceuticals Solutions donated the study gels, provided regulatory support and participated in the design and management of the study. The Microbicides Development Programme (MDP) is a partnership of African, UK and Spanish academic/government institutions and commercial organizations. The MDP 301 clinical trial was funded by the British Government’s Department for International Development (DfID) and the UK Medical Research Council. The funding body did not participate in the design, collection, analysis, and interpretation of data and writing of the manuscript.

Availability of data and materials

The MRC has a data sharing policy which summarizes the conditions under which data collected by the MRC/UVRI Uganda Research Unit on AIDS can be made available to other bona fide researchers, the way in which such researchers can apply to have access to the data and how data will be made available if an application for data sharing is approved. Should any of the other researchers need to have access to the data from which this manuscript was generated, we can make this policy available for them to request for the data. The corresponding and other co-author emails have been provided and could be contacted anytime.

Authors’ contributions

Conceived and designed the experiments: AK, SM, AN, MG. Analysed data: AA and JL. Wrote the initial draft: AA and MG. Reviewed and made substantive contributions to the paper: AA, MG, ZA, AN, AC, JL, SM and AK. All authors read and approved the final manuscript.

Authors’ information

Authors AA, ZA and AK are employees of the Medical Research Council/Uganda Virus Research Institute (MRC/UVRI) unit which was established and is funded by the MRC – UK. Authors MG, SM, AC and AN are employees of the MRC Clinical Trials Unit at University College London, UK. Author JL was head of Statistics at the MRC/UVRI Unit and currently a professor of Public Health at the School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

This Manuscript does not contain any individual person’s data in any form (including individual details, images or videos).

Ethics approval and consent to participate

The trial protocol was reviewed by relevant ethics committees in the United Kingdom (UK) and approved in each participating country, including the Uganda Virus Research Institute Research and Ethics committee (Protocol Number ISRCTN64716212) and the Uganda National Council for Science and Technology. Authorization was obtained from the relevant national drug regulatory authorities in participating countries, including the Uganda National Drug Authority, and the US Food and Drug Administration. Participants provided written informed consent before being enrolled into the trial.

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Correspondence to Andrew Abaasa.

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Abaasa, A., Gafos, M., Anywaine, Z. et al. Uptake of hormonal contraceptives and correlates of uptake in a phase III clinical trial in rural South Western Uganda. Reprod Health 14, 36 (2017).

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  • Hormonal contraceptives
  • Contraceptive uptake
  • Microbicides
  • Clinical trials