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Rates and predictors of adherence and retention for antiretroviral therapy among HIV-positive adults in Enugu, Nigeria

Onyinye Hope Chime1,2, Edmund Onyemaechi Ndibuagu1,2 and Chinonyelu Jennie Orji1

1Department of Community Medicine, Enugu State University Teaching Hospital, Enugu, Nigeria

2Department of Community Medicine, Enugu State University College of Medicine, Enugu, Nigeria


Abstract

Background

HIV infection and AIDS are major public health challenges in Nigeria, a country with one of the highest rates of new infection in sub-Saharan Africa and the second largest HIV epidemic in the world. Non-adherence to medication and defaulting from treatment are the two major challenges faced by anti-retroviral therapy (ART) programs in resource-constrained settings. This study was undertaken to determine the rate and predictors of adherence to medication and retention among people living with HIV in Enugu State, Nigeria.

Methods

This was a cross-sectional retrospective study conducted among adults living with HIV (PLHIV) receiving ARTs in eight comprehensive health facilities in Enugu, Nigeria. We used self-reported adherence and recorded clinic visits to assess adherence and retention, respectively. Descriptive statistics (frequencies, proportions, mean and standard deviation) and regression analysis were then conducted to identify the association between adherence, retention and demographic and health-related factors.

Results

The mean age of respondents was 38.5±9.8 years. Predictors of good adherence to medication included being male (adjusted odds ratio [AOR]: 2.08; 95% confidence interval [CI]: 1.12–3.85), having been on anti-retroviral medications for more than 5 years (AOR: 1.92; 95% CI: 1.17–3.16), the non-consumption of alcohol (AOR: 3.67; 95% CI: 2.01–6.70), not using traditional medicine (AOR: 2.76; 95% CI: 1.33–5.73) and having a baseline CD4 count exceeding 500 cells/μl (AOR: 5.67; 95% CI: 1.32–24.32). Adequate retention was predicted by being resident in the urban area (AOR: 1.90; 95% CI: 1.17–3.06). Being away from home (41.8%) and forgetfulness (35.0%) were reported as the major reasons for missing medication.

Conclusion

The rates of adherence and retention found in this study were similar to those reported for other resource-limited settings. Health education and behavioural modification interventions should be intensified to reduce the consumption of alcohol and the use of traditional medicine by people living with HIV. Identifying other factors may help to design effective strategies to ensure that people living with HIV adhere to their medications and remain in care.

Key Words

Adherence, retention, predictors, PLHIV, Enugu State, Nigeria


© 2019 The College of Medicine and the Medical Association of Malawi. This work is licensed under the Creative Commons Attribution 4.0 International License. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)


Introduction

Sub-Saharan Africa, home to over 10% of the world’s population, remains the worst HIV-affected region in the world. In fact, this geographical area is home to approximately 70% of all people living with HIV (PLHIV) globally1. While the number of people newly diagnosed with HIV is falling, both HIV and AIDS remain major public health challenges in Nigeria, the country with the second largest HIV epidemic in the world2. Findings from the 2014 HIV National Sentinel Survey showed that Nigeria, Africa’s most populous nation with a population of 186 million, had an HIV prevalence of 3.0%. ranging from 0.9% to 15.4% across different zones2,3. Furthermore, this survey showed that 1.6 million women were living with HIV compared with 1.4 million men2,3. The magnitude of the HIV epidemic, and the complexity of its chronicity, however, represent major challenges to healthcare delivery systems in both resource-rich and resource-constrained settings4. In resource-constrained settings, in which healthcare services are not well developed, there are two major challenges faced by anti-retroviral therapy (ART) programs: poor adherence to treatment and defaulting from treatment5.

Adherence has been difficult to sustain for patients receiving highly active anti-retroviral therapy (HAART) across the globe6. The mean rate of adherence to ART is approximately 70%, despite the fact that long-term viral suppression requires near-perfect adherence7. On the other hand, poor adherence compromises the efficacy of treatment, making this a critical public health issue8. As one of the major predictors of progression to AIDS and death after CD4 count, poor adherence is also associated with the development of drug-resistant viral strains and virological failure7,9,10. The results of a 2006 meta-analysis of ART adherence showed that, on average, 23% of patients in studies from sub-Saharan Africa did not achieve adequate adherence, with the proportion of non-adherent patients ranging from 2% to 70%11.

Despite the widely acknowledge scale-up in the use of ARTs, retaining patients in care remains a well-documented global challenge and has undermined efforts to enhance treatment outcomes12,13. Patient retention is a function of attrition which includes deaths, patients who are lost-to-follow-up (LTFU) and those who stop treatment. LTFU is the most common cause of attrition, followed by death12. Furthermore, LTFU has been shown to contribute to poorer health outcomes for patients, constitutes a serious form of resource wastage, and can promote HIV drug resistance14. In 2007, a meta-analysis of ART programs in Africa showed a retention of approximately 60% and 76% of patients on ART at the end of 2 years and 3 years, respectively15. Similar findings were reported in an updated meta-analysis of 39 cohorts from sub-Saharan Africa in 201112.

Many barriers to adherence are common to both developed and developing settings, such as fear of disclosure. Other barriers are unique to studies conducted in the developing world, such as financial constraints (cost of drugs and/or transport) and others, such as stigma, a feeling of being healthy and forgetfulness5,16,17. Other factors can also make it more difficult for patients to adhere to treatment, including mental illness, the complexity of drug regimes, the side effects of medication, active alcohol use, substance abuse and the non-disclosure of HIV status6,18,19. Factors such as increased duration on ART, male gender, an age of less than 15 years and a World Health Organization (WHO) classification of stage III and IV have been shown to be significantly associated with retention20. Based on a study population in south-eastern Nigeria, Onoka et al. reported that being male, having a CD4 count less than 200/μl and being treated by a public hospital were good predictors of retention-in-care20. In another study, Eguzo et al. found that baseline CD4 count, the year of enrolment and drug combination were significant predictors of retention14.

With the positive strides already gained in the fight against AIDS over recent years, the paradigm of HIV care has now shifted to the establishment of a continuum of care among PLHIV. Although research has shown that adequate ART adherence rates can be achieved in resource-poor settings11, there are concerns that adherence to ART in such settings may decline as access to treatment increases10. The present study collaborated with several healthcare facilities within Enungu State Nigeria and aimed to investigate adherence to medication and retention among PLHIV. Findings from this study will aid the planning and implementation of intervention programs so that we can scale-up ART adherence and retention of PLHIV in Enugu State Nigeria.

Methods

Study setting

Enugu state is one of the five states in south-eastern Nigeria, with a population of 3,257,298 people22, three senatorial zones and 17 local government areas (which serve as administrative units for the state). The ART program was introduced into this state in 2004 and first began to provide free drugs to patients in 2006. In Enungu state, ART services are now offered in 21 comprehensive ART sites, in both public and private health institutions. This study was conducted in eight comprehensive health facilities in Enugu state: Mother of Christ Specialist Hospital, University of Nigeria Teaching Hospital, Annunciation Specialist Hospital, Enugu State University Teaching Hospital, Nsukka District Hospital, Bishop Shanahan Hospital, Udi District Hospital and General Hospital Nsukka.

Table 1. Socio-demographic characteristics of respondents (N=840)

Study design, population and sampling

This study combined both cross-sectional and retrospective study designs involving PLHIV who accessed care in comprehensive health facilities in Enugu state. We included all PLHIV that were over 18 years of age and had been on HAART for at least 1 year prior to the study commencing. We excluded patients who refused to provide consent, whose records were incomplete or missing, or who were in HIV clinical stage III or IV and in a generally poor clinical state at presentation, usually with complicated AIDS-defining illness. The minimum sample size for the study was determined based on the expected proportion of adherence to ART among PLHIV in a previous study (75%)5; the calculations involved the use of Fisher’s statistical formula23. However, in order to increase the validity of the study, a sample size of 840 was used, with a relative precision of 5% and a confidence interval of 95%.

Table 1 Cont…

We then compiled a list of patients attending ART clinics using files from the medical records department of the eight selected health facilities. We used this data to then determine the sampling frame for the study. The eight facilities were selected proportionately from the three senatorial zones. The sample size was proportionally allocated to the facilities based on their patient load. A systematic sampling technique was then used to select the study participants as they presented for their routine clinic visits.

Table 2. Adherence and retention rates of PLHIV in Enugu

Data collection

The study lasted for 6 weeks (August to September 2016). Data was collected from study participants using two approaches; a pre-tested semi-structured interviewer-administered questionnaire designed by the principal researcher, and medical records. The questionnaire contained a section relating to socio-demographic information and another section on self-reported adherence. Additional questions were developed to acquire responses peculiar to this study such as disclosure, social habits and the HIV status of partner. We reviewed the medical records of each participant to ascertain retention over a period of 1 year prior to the study. Routine health data were extracted from medical records, including the year of HIV diagnosis, the duration on HAART, the type of regimen, dosing frequency and the regularity of routine clinic visits. The questionnaire was pretested among 42 randomly selected PLHIV from a health facility in Agbani district, which was not selected for the main study. Ambiguities or deficiencies in the study instruments were then revised.

Table 3. Predictors of adherence to ART among PLHIV in Enugu

Ethical approval was obtained from the Health Research and Ethics Committee of Enugu State University Teaching Hospital, Enugu. The study was also approved by the State Ministry of Health and the Heads of the health facilities involved. Written consent was secured from each participant and anonymity was assured. We used the pharmacy records, regimen type and dosing frequency to estimate the total number of doses expected and delivered within a 1-month period. In order to determine self-reported adherence, we asked our participants the following question: ‘How many pills were you unable to take in the past 28 days?’ Self-reported adherence was then ascertained by calculating the proportion (%) of medication (pills) taken over 28 days divided by the number of pills prescribed within the same period. In this study, adherence was classified as either good or poor. Good adherence was scored as ‘1’ while poor adherence was scored as ‘0’. Participants who achieved an adherence of less than 95% were classified as having poor adherence, while those with an adherence of 95% and above were classified as having good adherence; these classifications were based on established WHO definitions24.

Table 4. Predictors of retention

Retention was assessed using the medical records of each participant over a period of 1 year prior to the study commencing. Participants who were absent from treatment for at least 90 days (3 months) from the last given refill or appointment date were considered LTFU and scored as ‘0’ while those that reported at least once within 3 months were scored as ‘1’20. The quarterly visits (four visits annually) were summated over the year. For the purpose of this study, retention was categorized as either adequate or inadequate. Adequate retention was scored as ‘1’ while inadequate was scored as ‘0’. Participants with a total of four visits were categorized as having adequate retention while those who made less than four visits were categorized as having inadequate retention. To avoid recall bias, we extracted this information from the hospital records of each participant.

Data analysis

Data cleaning and editing were performed manually and were designed to detect omissions and ensure uniform coding. Data entry and analysis were performed using the Statistical Package for Social Sciences (SPSS) version 22. Frequencies and proportions were derived for categorical variables and analysed using the chi-square test and Student’s t-test. Multivariate analysis, using binary logistic regression, was also used to predict the probability of occurrence for each outcome variable. Results are reported as odds ratios and 95% confidence intervals; the level of significance was set to 0.05. Variables showing a P-value <0.2 in the bivariate analysis were subsequently entered into a multivariate binary logistic regression model to determine predictors of medication adherence and retention.

In addition, we also determined the socio-economic status (SES) index for each patient using principal component analysis (PCA) and Stata statistical software version 10. The data used for PCA were (1) estimated monthly household income and (2) ownership of ten household modern assets, including radio, plasma television, refrigerator, cable television, electric fan, air conditioner, motor vehicle, washing machine, gas cooker and electric iron. Each respondent was assigned to either a low or high SES index based on the wealth index score of their household.

Results

Table 1 shows the socio-demographic characteristics of our respondents; the mean age of respondents was 38.5±9.8 years. The highest proportion of respondents were aged 30–39 years. The majority of respondents were females (76.3%), which reflects the present demographics of patients receiving HIV/AIDS care and treatment in Nigeria. Most respondents were self-employed (74.2%) and there was a greater proportion of respondents residing in rural areas (65.8%). More than 50% of respondents (497) had been on HAART for less than 4 years. Furthermore, there were more respondents on a first line regimen (80.4%) than those on a second line regimen (19.6%). When defined by a CD4 count < 200 cells/µl, 43% of our study participants (n=361) had AIDS.

Male respondents were twice as likely to adhere to their ART than their female counterparts (adjusted odds ratio [AOR]: 2.08; 95% confidence interval [CI]: 1.12–3.85) (Table 3). Respondents on HAART for more than 5 years were also twice as likely to achieve adherence when compared with those who had taken HAART for less than 5 years (AOR: 1.92; 95% CI: 1.17–3.16). Similarly, respondents who did not take alcohol had approximately four times the odds of being adherent to their medications when compared to those who did use alcohol (AOR 3.67, 95% CI: 2.01–6.70). Those who did not consume traditional medicine were approximately three times more likely to have better adherence than those who did consume traditional medicine (AOR: 2.76; 95% CI: 1.33–5.73). Respondents with a baseline CD4 count >500cells/μl (AOR: 5.67; 95% CI: 1.32–24.32) more likely to be adherent when compared with those having a baseline CD4 count < 200 cells/μl. Participants who resided in urban areas were approximately twice as likely to show adequate retainment (AOR: 1.90; 95% CI: 1.17–3.06) as those who resided in rural areas (Table 4).

The commonest reasons for missing medication were being away from home (41.8%) and forgetfulness (35.0%). Other reasons included physical discomfort (6.8%), running out of medication (12.6%), could not hide to take the drugs (2.4%) and fasting (1.4%) (Figure 1).

Figure 1. Reasons for missed medications (N=294)

 

Discussion

The WHO reports that approximately one-third of patients suffering from HIV/AIDS take their medication as prescribed24. However, this remains a significant challenge for patients living in both developed and developing countries. The self-reported adherence to ART in this study was 89.5%, slightly higher than the 85.8% that was previously reported in Nnewi, another city in south-east Nigeria25. Seven years ago, when ART programs were only just being developed in our study area, the level of adherence was as low as 75%5. This may possibly have been due to the lack of drugs in several health facilities during this period of time. Thus, inconsistent access to medications could have presented a challenge to the delivery system and unwittingly encouraged non-adherence. However, with enhanced availability and accessibility to medications, as well as the provision of free ART services, it is evident that adherence has improved significantly in this region. The results of our study were consistent with previous findings from some other developing African countries, where a high rate of adherence (based on self-reporting) has also been reported, including Ghana (86%)26, Rwanda (77%)27 and Ethiopia (95%)28. Interestingly, this finding is in direct contrast to a previous WHO report which stated that the mean adherence rate to long-term therapy for chronic illnesses in developed countries was approximately 50%, and that in developing countries, the rates were even lower24. We found that being away from home and forgetfulness were reported as the major reasons for missing medication; similar factors were noted in some other studies29,30. Other, less frequently reported reasons for missed doses included stock control problems for drugs, discomfort/side effects, being ashamed of taking medication in front of others and fasting.

The retention of PLHIV on ART in this study (87.1%) was higher than the 82.6% and 66.5% previously reported in private and public facilities in South-East Nigeria, respectively21. Previous retrospective studies of Nigeria, carried out over 7 (2005–2012) and 5 years (2009–2013), showed retention rates of 63% and 76.1%, respectively14,31. Based on these findings, we can therefore infer that although patients are still LTFU, and there is clear potential for the development and transmission of drug-resistant strains of HIV, there has been a progressive improvement in the rate of retention in Nigeria. However, the approach of measuring retention in these retrospective studies focused on only one or more visits to the clinic each year and could therefore overestimate the level of retention as patients LTFU would not have been included. A similar progressive increase in retention has been documented in Ethiopia, where the retention rate has risen from 77% (2004–2005) to 92% (2012–2013)13. These progressive increases in retention rates could be due to the massive scale-up of HIV services and recent intervention programs aimed at improving retention in these countries. Our bivariate analyses revealed that there was a statistical association between adherence to medication and gender, the number of years on HAART, alcohol intake, the intake of traditional medicine and baseline CD4 cell count. The finding that men were more likely to adhere to their medication than women is a true reflection of gender issues in sub-Saharan Africa as African men are generally seen to have more “free” time and money at their disposal than women32. This finding was similar to a previous study carried out in south-east Nigeria, which found that females were less adherent to their medications due to forgetfulness, poor communication and the side effects of drugs19. Furthermore, due to cultural barriers, women in our study setting may have had difficulties disclosing their status, thus meaning that they need to hide while taking their medications.

 

Patients who have been on HAART for a longer duration would have been exposed to the relative advantages and disadvantages of adhering to their medication as they would have witnessed treatment failure and possibly the death of non-adherent patients. Poor adherence rates among those who have been on HAART for short durations could also be the result of anti-retroviral-related toxicity experienced when the medication was first introduced. This significant finding implies that adherence improves over longer durations of treatment. Similar findings were described for Botswana, where patients who had been receiving ART for the shortest duration of time (1–6 months) had the poorest adherence to medication33. However, a conflicting finding was reported for HIV-positive pregnant women in south-east Nigeria; in this particular cohort of patients, there was a lower rate of adherence reported for those who had been on HAART for long periods of time34. This finding was attributed to complacency, especially among long-term patients who saw clear improvements in their physical and psychological function. This may have reduced their motivation to adhere to anti-retroviral medications after delivery.

Our study further showed that patients who took alcohol and traditional medicine showed poor adherence to their medications. The association between alcohol intake and adherence has been documented in previous studies35. In contrast to our present findings, drinking alcohol was not associated with non-adherence to antiretroviral therapy in a study carried out in Ethiopia36. This inconsistency could represent socio-cultural differences in the two different study settings. Although the intake of traditional concoctions has been reported as a barrier to ART adherence, PLHIV on anti-retrovirals in South Africa still ingest these concoctions, which are sourced from traditional healers, while adhering to their ART, as they are reported to act as an internal body cleanser37.

In most resource-limited countries of Africa, where most of the world’s HIV-infected people live, the diagnosis of HIV infection is often made during advanced stages when AIDS-defining illnesses begin to manifest38. It is therefore not surprising that a CD4 count <200 cells could predict adherence to medication in this study; 43% of patients presented with a CD4 count <200 cells at baseline. Similarly, other studies have reported that patients with CD4 counts > 200 cells at the beginning of ART were at a higher risk of non-adherence7,39. These patients probably deem themselves to be healthy and therefore decided not to carry on with their medications.

Retaining PLHIV has the potential not only to limit health care costs but also to provide the opportunity to implement preventive health care interventions. This may promote behavioural changes in healthcare, thus leading to a reduction in HIV transmission and burden, thus leading to a general improvement in public health40. We found that the area of residence was a significant predictor of retention in our present study. Patients residing in rural areas might have difficulties accessing health facilities. This is because more health facilities offer HIV treatment services in urban areas than rural areas, thus making it difficult for those in rural areas to access care. Distance to the clinic, as well as travel times that exceed 2 hours due to bad roads, or financial constraints, have also been identified as major barriers to retention in previous studies14,40.

Conclusion

The rate of adherence to medication and retention-in-care was higher in our study area than other studies conducted in Nigeria. Gender, the number of years on HAART, alcohol intake and the intake of traditional medicine predicted non-adherence to medication while residence in urban areas predicted retention. While some of these factors are modifiable, others are not. Based on this study, we recommend that to achieve good adherence and adequate retention, programs and research should focus on interventions that can particularly improve adherence among females and lead to behavioural modifications which can reduce the intake of alcohol and traditional medications in the study area. These practices will invariably improve the adherence to ART in this region. Although the level of adherence to medication among PLHIV is increasing in south-east Nigeria, there is a need for sustained improvement to ensure optimal health outcomes. A decline in adherence has been projected in resource-limited settings as treatment access increases. Although the number of available treatment facilities continues to increase in this setting, patients may continue to avoid accessing care from facilities within their communities because of stigma. Consequently, the scale-up of treatment facilities must be coupled with social support from the community. Our findings also support the need to evaluate access to health facilities based on their localities to ascertain measures to specifically support patients in rural settings.

Limitations

There is no gold standard for measuring adherence. In the present study, we based adherence only by analysing the self-reporting of missed doses over a period of 28 days. It is possible that this may be affected by recall bias and overestimation7. The use of more objective measures, such as a microelectronic monitoring system for pill counts, would have provided a more comprehensive assessment of adherence than self-reporting. However, a simple self-report adherence questionnaire, such as the one used in this study, has previously been reported to provide a profound degree of non-adherence that predicts viral rebound and is almost always reliable7. Finally, the exclusion of patients who have been on HAART for less than a year, as well as patients in HIV clinical stage 3 and 4, may also affect the generalization of the findings of this study.

Acknowledgments

We would like to thank the PLHIV who agreed to participate, and the healthcare workers in the respective health facilities, including the peer support group coordinators, for their efforts and co-operation.

Conflicts of interest

The authors have no conflicts of interest to declare.

Funding

The researchers did not receive a specific grant from funding agencies in the public, commercial or not for profit sectors.

Ethical considerations

Ethical approval for this study was obtained from the Health Research and Ethics Committee of Enugu State University Teaching Hospital (ESUTH) Enugu, Nigeria. Approval was also obtained from the Enugu State Ministry of Health and the management of the selected health facilities. Written informed consent was obtained from each of the participants.

Availability of data and materials

Materials and data are available from the Department of Community Medicine, Enugu State University Teaching Hospital for a period of 5 years following publication.

 Authors’ contributions

OC conceived, designed and drafted this study. CO analysed and interpreted the data, while EN provided administrative and technical support. All authors critically revised the manuscript and approved the final version for publication.

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