Low haemoglobin predicts early mortality among adults starting antiretroviral therapy in an HIV care programme in South Africa: a cohort study
© Russell et al; licensee BioMed Central Ltd. 2010
Received: 25 November 2009
Accepted: 23 July 2010
Published: 23 July 2010
Antiretroviral therapy (ART) has dramatically reduced morbidity and mortality among people with HIV infection; however, mortality after the start of ART is high in resource-limited settings. We investigated risk factors for mortality among adults starting ART in a multi-clinic community programme in South Africa.
Cohort of adults starting ART at 27 clinics between February 2005 and June 2006, followed to 31st March 2007. Kaplan-Meier survival estimates were used to describe overall mortality. Shared frailty Cox regression was used to identify baseline risk factors for early mortality.
Among 1350 participants (median age 35.5 years, 60% female, median CD4 count 83/μL [interquartile range (27 - 147)], median follow-up 13.4 months), there were 185 deaths, overall mortality rate 13/100 pyrs; for 0-3, 3-9 and >9 months from ART start mortality rates were 24, 13 and 6/100 pyrs respectively. 43% of the deaths were in the first 3 months of treatment. Risk factors for mortality in univariable analysis were baseline CD4 count, viral load, haemoglobin and body mass index, in multivariable analysis adjusting for age and gender, only CD4 count and haemoglobin remained independently associated with proportional hazards not being satisfied for haemoglobin. Adjusted hazard ratios (aHR) for participants with haemoglobin <8, 8.1-9.9, >11.9(f)/12.9 (m) g/mL were 4.99, 3.05 and 0.12 respectively comparing to 10-11.9 (f)/12.9 (m)g/mL in the first 3 months of ART. aHRs for CD4 counts were 0.40, 0.38 and 0.34 for 50-99, 100-200 and >200/μL comparing to <50/μL.
The high mortality rate in the first 3 months underlines the need for earlier HIV diagnosis so that ART can be initiated earlier. Low haemoglobin and low CD4 count are both strong predictors of mortality, and could be used to identify individuals at high risk who might benefit from intensive case management.
South Africa is estimated to have 5.7 million HIV-positive individuals out of a total population of 48.6 million  and has more people living with HIV/AIDS than any other country worldwide  which is a considerable challenge for health care systems and communities across the country. A key component of a suitable and extensive response to this growing epidemic, especially in communities most affected by HIV, is combination antiretroviral therapy (cART)  and it is estimated that 889,000 adults (less than 49 years old) and children in South Africa are in urgent need of this treatment .
Although treatment programmes have been scaled up and increased in number they still face challenges. Studies in Sub-Saharan Africa show that one of these challenges is that mortality in these programmes is much higher in the first three months [5–9]. One of the reasons for this is that despite better availability of ART, people are still diagnosed late and thus start ART when they already have late stage disease. Identifying those at highest of early mortality risk could help target interventions to improve survival.
The data for this study were collected from a large community based programme set in clinics run by NGOs or private practitioners in five provinces of South Africa. The clinics provide standardised HIV care and treatment through a programme implemented by the Aurum Institute. We describe early mortality and loss to follow-up, and risk factors for mortality in this setting.
Study design, setting and population
This was a prospective cohort study examining routinely collected clinic data from an observational cohort of adult patients to examine risk factors for early mortality. The clinics contributing data to the study were in urban and peri-urban sites in five provinces of South Africa (Gauteng, Limpopo, Free State, Mpumalanga, and North West). The clinics were either run by a non-government organisation (NGO), or private practitioners. Training, clinical and financial support, drug procurement, and administration and monitoring support were provided by the Aurum Institute. This programme provided free antiretroviral treatment to patients who did not have medical insurance and were unable to pay for their treatment themselves. The organisation of the programme as it was originally developed in an industrial setting has been described elsewhere .
The clinics followed the National South African HIV treatment guidelines for participants starting ART: either CD4 <200/μL or classified as in WHO stage 4. The first line regimen given to the majority of patients was stavudine, lamivudine, and either nevirapine or efavirenz. Patients starting ART attend monthly to collect medication; they have a clinical review and blood taken for full blood count and liver function tests at six weeks, three months and three monthly thereafter; and CD4 count and viral load at six weeks, six months and six monthly thereafter.
Patients were included in this analysis if they were 18 years or older when initiating ART treatment, if they were attending clinics that had over 50 participants in HIV care in the programme, and if they were ART-naïve (by self-report) when enrolled into the programme. The participants in this cohort all began their treatment between 1st February 2005 and 1st June 2006, giving them an opportunity to have at least 10 months follow-up before the cohort was censored on the 31st March 2007.
Data sources and follow-up
The data were collected through routine health care services. Forms, completed at both scheduled and unscheduled visits, included information on CD4 count, haemoglobin, viral load, height, weight, and previous treatments. Participants with less than 8 g/mL of haemoglobin were classified as severely anaemic, and those with < 12 (<13 for men) g/mL as anaemic. In this analysis, patients were followed up from the date of ART treatment initiation until the date of death, date of leaving the programme, lost to follow-up or 31st March 2007, whichever came first. Deregistration forms provided information on participants leaving the programme alive and deaths whilst on treatment. Deaths were ascertained based on information from relatives or local hospital services, or by clinic staff attempting to contact patients who had not attended scheduled follow-up appointments. Records were checked to confirm that participants without a death or deregistration recorded were alive and attending the clinic as of 31st March 2007. Reasons for leaving the programme, documented on the deregistration form, were relocated out of the area, transferred out of the programme or patient stopped treatment. Patients were defined as lost to follow-up if either the deregistration form documented lost to follow-up with no supplementary data for the reason or the most recent clinic visit occurred more than 6 months before 31st March 2007.
Data were analysed using STATA v. 10 (Stata Corporation, College Station, Texas, USA). CD4 count, viral load, haemoglobin levels and body mass index (BMI) at baseline were defined as the results closest to the date of ART start, restricted to the time interval 90 days before and 15 days after ART start, with viral load restricted to within 4 days after ART start, and if more than one measurement was available, the viral load before ART start was used.
The cohort was analysed using an intent-to-treat approach, assuming that once started on ART, patients remained on ART without interruption [7, 12]. Mortality rates were compared using Poisson regression. Kaplan-Meier curves were used to summarise survival experience and Kaplan-Meier probabilities of survival at 3 and 9 months were also calculated for each variable.
Univariable analysis was carried out using the Cox proportional hazards model with shared frailty to calculate unadjusted hazard ratios for baseline variables. Shared frailty was used to take into account that individuals attending the same clinic may be more similar to each other with respect to outcomes and measures associated with outcomes than to those attending other clinics. Likelihood ratio tests were used to assess departures from linearity and for linear trend for ordinal variables. Proportional hazards were assessed by a lexis expansion at 3 months follow-up time and Schoenfeld residuals were also examined for departures from the proportional hazards assumption.
A multivariable model was constructed by retaining variables that were considered a priori confounders and those that were associated in univariable analysis (p < 0.1 based on likelihood ratio tests). BMI as a baseline risk factor had more than 20% missing data so a model using multiple imputation was examined, with 10 imputed datasets derived  and estimates combined on the basis of Rubin's Rules . Baseline characteristics of patients who left the programme alive were compared with those who were still in follow-up at the censoring date for the cohort using the chi-square test or Wilcoxon rank sum test.
This study was approved by the Research Ethics Committees of the University of KwaZulu-Natal, South Africa and the London School of Hygiene and Tropical Medicine, UK. Data were anonymised prior to analysis.
Characteristics of study population
Descriptive analysis of all antiretroviral therapy cohort participants (n = 1350)
All patients (n = 1350)
Median age in years (IQR)
35.5 (30.2, 41.9)
CD4 count at baseline
n = 1257
Median number of cells per μL (IQR)
Count <50 cells per μL
Viral load at baseline
n = 1187
Median log10 copies per mL (IQR)
4.92 (4.42, 5.38)
Count >5 log10 copies per mL
Haemoglobin at baseline
n = 1206
Median g/mL (IQR)
11.5 (9.9, 13)
Count <8 g/mL (severely anaemic)
Body mass index (BMI) at baseline
n = 854
Median kg/m2 (IQR)
21.4 (18.5, 24.3)
Count <18.5 kg/m2 (underweight)
Previous tuberculosis diagnosis
Currently drinks alcohol
Previous tuberculosis preventive therapy
Outcomes and follow-up
The median follow-up time for the 1350 participants in this cohort was 13.4 months (IQR 10.1, 16.8) with 937 participants alive and in the programme at the censoring date of 31st March 2007, and 185 deaths. A total of 228 participants were censored alive before 31st March 2007; 148 (64.9%) patients were defined as lost to follow-up and 80 (35.1%) patients left the programme early (30 relocated out of the area, 26 stopped treatment and 24 transferred out of the programme). Those who were censored alive before 31st March 2007 compared to those who were alive at the end of follow-up were more likely to be male (p = 0.01, chi-square test) and their median haemoglobin level was 11.4 g/mL compared to 11.8 g/mL (p = 0.03, Wilcoxon rank sum test); there was no evidence for differences between those who left the programme and those alive at the end of follow-up in terms of baseline CD4 count, BMI, and age at ART start (data not shown).
There were 185 deaths during follow-up giving an overall mortality rate of 13 per 100 person years (pyrs), with 94% alive at 3 months and 88% at 9 months. The mortality rate in the first 3 months was 24.5 per 100 pyrs, decreasing to 13 and 6 per 100 pyrs for 3 - 9 months and greater than 9 months following the start of ART, respectively (p < 0.0001). Seventy nine of the deaths (42.7%) occurred in the first 3 months.
Risk factors for mortality
Unadjusted hazard ratios, 95% confidence intervals and survival probabilities for 3 and 9 months (n = 1350)
Number of patients (Column %)
Unadjusted hazard ratio (95% CI)
Likelihood ratio test
Kaplan-Meier probability of survival 3 months 9 months
p = 0.49
0.9 (0.67, 1.21)
Age group (years)
p = 0.14
18 to 29
30 to 34
1.36 (86.7, 2.14)
35 to 39
1.77 (1.14, 2.74)
40 to 49
1.31 (0.83, 2.08)
50 to 70
1.44 (0.79, 2.63)
CD4 count (per μL) (n = 1257)
p < 0.0001
0 to 49
50 to 99
0.37 (0.23, 0.58)
100 to 200
0.28 (0.18, 0.42)
0.21 (0.10, 0.45)
Viral load (log 10 copies/mL) (n = 1187)
p < 0.0001
0.30 (0.15, 0.60)
4 to 5
0.47 (0.34, 0.66)
Haemoglobin (g/mL) (n = 1206)*
p < 0.0001
3.24 (2.12, 4.94)
8.1 - 9.9
1.94 (1.32, 2.86)
10 - 11.9 (12.9 for men)
>11.9 (>12.9 for men)
0.38 (0.24, 0.63)
Body mass index (kg/m 2 ) (n = 854)
p < 0.0001
2.05 (1.41, 2.96)
18.5 to 25
0.67 (0.38, 1.16)
previous tuberculosis diagnosis
p = 0.12
1.3 (0.94, 1.81)
previous tuberculosis preventive therapy
0.86 (0.31, 2.35)
p = 0.77
p = 0.41
0.91 (0.67, 1.24)
1.18 (0.57, 2.47)
0.52 (0.21, 1.29)
Adjusted hazard ratios for mortality from multivariate analysis, with 95% confidence intervals (n = 1195)
aHR2 (95% CI)
Likelihood Ratio test
0.89 (0.65, 1.23)
0.87 (0.63, 1.2)
Age group (years)
18 to 29
30 to 34
1.43 (0.88, 2.32)
1.37 (0.84, 2.22)
35 to 39
1.85 (1.15, 2.97)
1.67 (1.03, 2.69)
40 to 49
1.27 (0.78, 2.1)
1.25 (0.75, 2.07)
50 to 70
1.44 (0.75, 2.74)
1.57 (0.82, 3.01)
CD4 count (/μL)
0 to 49
50 to 99
0.34 (0.21, 0.55)
0.40 (0.25, 0.64)
100 to 200
0.29 (0.19, 0.45)
0.38 (0.25, 0.58)
0.22 (0.1, 0.48)
0.34 (0.16, 0.74)
Time < 3 months
5.35 (2.91, 9.84)
4.99 (2.69, 9.24)
8.1 - 9.9
2.98 (1.67, 5.33)
3.05 (1.71, 5.48)
10 - 11.9 (12.9 for men)
>11.9 (>12.9 for men)
0.10 (0.23, 0.43)
0.12 (0.03, 0.52)
Time ≥ 3 months
2.00 (1.10, 3.70)
1.88 (1.01, 3.49)
8.1 - 9.9
1.27 (0.73, 2.20)
1.33 (0.77, 2.31)
10 - 11.9 (12.9 for men)
>11.9 (>12.9 for men)
0.50 (0.29, 0.86
0.59 (0.34, 1.02)
There was less than 10% change in the adjusted hazard ratios for BMI from multiple imputation compared to the adjusted hazard ratios from the reduced multivariable model with no imputation, after controlling for haemoglobin and CD4 count. Evidence for BMI being associated with mortality was weak (p = 0.11) which is consistent with the conclusions from the multivariable analysis with no imputation.
Discussion and Conclusions
This analysis, based on routinely collected data at clinics across South Africa, showed that there was high early mortality on ART with a large proportion (42.7%) of the deaths occurring in the first three months of treatment, consistent with other studies from sub-Saharan Africa . This is most likely attributable to very advanced disease at treatment start as evidenced by low CD4 count at baseline, typical of clinics in sub-Saharan Africa [8, 15–17]. High early on-ART mortality rates in resource-poor settings compared with industrialised countries are not completely explained by lower CD4 counts and more advanced clinical stage at baseline, but are probably compounded by co-morbidities, particularly tuberculosis, that are common in resource-poor settings. Thus there is a need to identify individuals at high risk of death who may benefit from investigation for concurrent disease within a more intensive case management programme. This analysis indicates that low CD4 count and low haemoglobin are important independent prognostic factors for mortality in this setting and either or both could be used to identify those at highest risk of death.
At three months after ART start, 13% of those with a baseline CD4 count below 50 had died compared with 3% of those with CD4 count of 50 and above, highlighting the strong association between baseline CD4 count and early mortality, consistent with other studies [3, 5, 7, 12, 18, 19]. Our results are also consistent with other studies showing that anaemia predicts mortality among individuals on ART in Africa and developed countries [12, 18, 20–22] although evidence is limited and thus this analysis, from a large cohort receiving care at multiple clinics, adds valuable information to support this. Anaemia in these settings is associated with conditions such as tuberculosis [Hanifa Y, unpublished data, personal communication] which may not be clinically apparent, but could potentially be treated; as well as other co-morbidities such as malnutrition, gastrointestinal Kaposi's sarcoma etc . Thus those individuals starting ART with a low haemoglobin in these settings are in particular need of investigation for, and if necessary treatment of, tuberculosis. More generally haemoglobin levels could be used by clinics to identify more promptly participants that are at very high risk of mortality in ART programmes when they start treatment and be very useful in settings where CD4 counts are less widely available. There could then be a programme of intensified case management and monitoring for these individuals at high risk. This could also involve more investigation for co-morbidities especially tuberculosis but should not delay the start of ART as there is a very high mortality rate for those waiting to start ART .
One in six participants in this cohort left the programme during follow-up, and for the majority of these there was none or only limited information on reasons for their departure, similar to other ART programmes in Africa [12, 15, 23, 24]. Although these individuals were similar to those alive at the end of follow-up in age, gender, CD4 count, viral load and BMI, the loss to follow-up may also lead to an under-estimate of mortality rates for this cohort as an unknown number of the 11.0% participants lost to follow-up may have died soon after leaving the programme. Studies in similar settings have shown that mortality is often underestimated when individuals are lost to follow-up and not actively traced [9, 25–27].
A strength of the data presented in this analysis is that individuals identified in this cohort had definitely started ART and collected their medication. This helps to reduce the bias that may occur if individuals who never started ART were contributing person-years to the study.
There were missing data for BMI (36.7%) but it was evaluated in the univariable and multivariable analyses and conclusions from the multivariable model were supported by multiple imputation methods. There was also no information on the cause of death for this cohort which would have been useful, as what had caused the early deaths and information regarding the deaths of those with very low haemoglobin would help to inform an intensified case management system. However there is increasing evidence from other studies about the importance of tuberculosis as an early cause of death [28, 29]
The results from this analysis give evidence that CD4 count and haemoglobin predict early mortality for individuals on ART in sub-Saharan Africa. Individuals starting ART with either low CD4 count or low haemoglobin should be targeted for intensified case management, including investigation for and treatment of coexistent infections, particularly tuberculosis in settings of high tuberculosis prevalence. In clinics without access to CD4 counts, haemoglobin may be useful to identify those at highest risk.
We thank the many staff of the Aurum Institute, collaborators in the ART programme who contributed to the establishment and running of the HIV care programmes, and the many people who collected data for these studies.
ECR was supported by a UK MRC studentship/a Bill and Melinda Gates Foundation grant for the Consortium to Respond Effectively to the AIDS-TB Epidemic (CREATE), KF was supported by the Aurum Institute and CREATE Biostatistics core, and ADG by a UK Department of Health Public Health Career scientist award. GJC is supported by grants from the National Institutes of Health (grant# AI069469 and AI51794) and from the President's Emergency Plan for AIDS Relief (PEPfAR) (U2GPS000811, SU062PS024055). GJC was also supported by CREATE
Subjects in this study were enrolled in treatment programmes supported by the U.S. President's Emergency Plan for AIDS Relief and by Cooperative Agreement Number PS024055 from the Department of Health and Human Services/Centers for Disease Control and Prevention (CDC), National Center for HIV, Viral Hepatitis, STD, and TB Prevention (NCHHSTP), Global AIDS Program (GAP). The content of this manuscript are solely the responsibility of the authors and do not necessarily represent the official views of CDC.
- UNAIDS/WHO: Epidemiological Fact Sheets on HIV and AIDS, 2008 update. 2008, WHOGoogle Scholar
- UNAIDS: 2008 Report in the global AIDS epidemic UNAIDS. 2008Google Scholar
- Coetzee D, Hildebrand K, Boulle A, Maartens G, Louis F, Labatala V, Reuter H, Ntwana N, Goemaere E: Outcomes after two years of providing antiretroviral treatment in Khayelitsha, South Africa. AIDS. 2004, 18: 887-895. 10.1097/00002030-200404090-00006.View ArticlePubMedGoogle Scholar
- UNGASS: Progress Report on Declaration of Commitment on HIV and AIDS - South Africa. 2007, 28-Google Scholar
- Lawn SD, Myer L, Orrell C, Bekker LG, Wood R: Early mortality among adults accessing a community-based antiretroviral service in South Africa: implications for programme design. AIDS. 2005, 19: 2141-2148. 10.1097/01.aids.0000194802.89540.e1.View ArticlePubMedGoogle Scholar
- Etard JF, Ndiaye I, Thierry-Mieg M, Gueye NF, Gueye PM, Laniece I, Dieng AB, Diouf A, Laurent C, Mboup S, Sow PS, Delaporte E: Mortality and causes of death in adults receiving highly active antiretroviral therapy in Senegal: a 7-year cohort study. AIDS. 2006, 20: 1181-1189. 10.1097/01.aids.0000226959.87471.01.View ArticlePubMedGoogle Scholar
- Ferradini L, Jeannin A, Pinoges L, Izopet J, Odhiambo D, Mankhambo L, Karungi G, Szumilin E, Balandine S, Fedida G, Carrieri MP, Spire B, Ford N, Tassie JM, Guerin PJ, Brasher C: Scaling up of highly active antiretroviral therapy in a rural district of Malawi: an effectiveness assessment. Lancet. 2006, 367: 1335-1342. 10.1016/S0140-6736(06)68580-2.View ArticlePubMedGoogle Scholar
- Weidle PJ, Malamba S, Mwebaze R, Sozi C, Rukundo G, Downing R, Hanson D, Ochola D, Mugyenyi P, Mermin J, Samb B, Lackritz E: Assessment of a pilot antiretroviral drug therapy programme in Uganda: patients' response, survival, and drug resistance. Lancet. 2002, 360: 34-40. 10.1016/S0140-6736(02)09330-3.View ArticlePubMedGoogle Scholar
- Braitstein P, Brinkhof MW, Dabis F, Schechter M, Boulle A, Miotti P, Wood R, Laurent C, Sprinz E, Seyler C, Bangsberg DR, Balestre E, Sterne JA, May M, Egger M: Mortality of HIV-1-infected patients in the first year of antiretroviral therapy: comparison between low-income and high-income countries. Lancet. 2006, 367: 817-824. 10.1016/S0140-6736(06)68337-2.View ArticlePubMedGoogle Scholar
- Charalambous S, Grant AD, Day JH, Pemba L, Chaisson RE, Kruger P, Martin D, Wood R, Brink B, Churchyard GJ: Establishing a workplace antiretroviral therapy programme in South Africa. AIDS Care. 2007, 19: 34-41. 10.1080/09500340600677872.View ArticlePubMedGoogle Scholar
- WHO: Iron Deficiency Anaemia. Assessment, Prevention and Control: A Guide for programme managers. 2001, WHOGoogle Scholar
- Toure S, Kouadio B, Seyler C, Traore M, Dakoury-Dogbo N, Duvignac J, Diakite N, Karcher S, Grundmann C, Marlink R, Dabis F, Anglaret X: Rapid scaling-up of antiretroviral therapy in 10,000 adults in Cote d'Ivoire: 2-year outcomes and determinants. AIDS. 2008, 22: 873-882. 10.1097/QAD.0b013e3282f768f8.View ArticlePubMedPubMed CentralGoogle Scholar
- Royston P: Multiple Imputation of missing values. Stata Journal. 2004, 4: 227-241.Google Scholar
- Rubin DB: Multiple Imputation for nonresponse in surveys. 1987, New York: John WileyView ArticleGoogle Scholar
- Wools-Kaloustian K, Kimaiyo S, Diero L, Siika A, Sidle J, Yiannoutsos CT, Musick B, Einterz R, Fife KH, Tierney WM: Viability and effectiveness of large-scale HIV treatment initiatives in sub-Saharan Africa: experience from western Kenya. AIDS. 2006, 20: 41-48. 10.1097/01.aids.0000196177.65551.ea.View ArticlePubMedGoogle Scholar
- Wester CW, Kim S, Bussmann H, Avalos A, Ndwapi N, Peter TF, Gaolathe T, Mujugira A, Busang L, Vanderwarker C, Cardiello P, Johnson O, Thior I, Mazonde P, Moffat H, Essex M, Marlink R: Initial response to highly active antiretroviral therapy in HIV-1C-infected adults in a public sector treatment program in Botswana. J Acquir Immune Defic Syndr. 2005, 40: 336-343. 10.1097/01.qai.0000159668.80207.5b.View ArticlePubMedGoogle Scholar
- Ojikutu BO, Zheng H, Walensky RP, Lu Z, Losina E, Giddy J, Freedberg KA: Predictors of mortality in patients initiating antiretroviral therapy in Durban, South Africa. S Afr Med J. 2008, 98: 204-208.PubMedPubMed CentralGoogle Scholar
- Stringer JS, Zulu I, Levy J, Stringer EM, Mwango A, Chi BH, Mtonga V, Reid S, Cantrell RA, Bulterys M, Saag MS, Marlink RG, Mwinga A, Ellerbrock TV, Sinkala M: Rapid scale-up of antiretroviral therapy at primary care sites in Zambia: feasibility and early outcomes. JAMA. 2006, 296: 782-793. 10.1001/jama.296.7.782.View ArticlePubMedGoogle Scholar
- Lawn SD, Harries AD, Anglaret X, Myer L, Wood R: Early mortality among adults accessing antiretroviral treatment programmes in sub-Saharan Africa. AIDS. 2008, 22: 1897-1908. 10.1097/QAD.0b013e32830007cd.View ArticlePubMedGoogle Scholar
- Johannessen A, Naman E, Ngowi BJ, Sandvik L, Matee MI, Aglen HE, Gundersen SG, Bruun JN: Predictors of mortality in HIV-infected patients starting antiretroviral therapy in a rural hospital in Tanzania. BMC Infect Dis. 2008, 8: 52-10.1186/1471-2334-8-52.View ArticlePubMedPubMed CentralGoogle Scholar
- Harris RJ, Sterne JA, Abgrall S, Dabis F, Reiss P, Saag M, Phillips AN, Chene G, Gill JM, Justice AC, Rockstroh J, Sabin CA, Mocroft A, Bucher HC, Hogg RS, Monforte AD, May M, Egger M: Prognostic importance of anaemia in HIV type-1-infected patients starting antiretroviral therapy: collaborative analysis of prospective cohort studies. Antivir Ther. 2008, 13: 959-967.PubMedPubMed CentralGoogle Scholar
- Moh R, Danel C, Messou E, Ouassa T, Gabillard D, Anzian A, Abo Y, Salamon R, Bissagnene E, Seyler C, Anglaret X: Incidence and determinants of mortality and morbidity following early antiretroviral therapy initiation in HIV-infected adults in West Africa. AIDS. 2007, 21: 2483-2491. 10.1097/QAD.0b013e3282f09876.View ArticlePubMedGoogle Scholar
- Dalal RP, Macphail C, Mqhayi M, Wing J, Feldman C, Chersich MF, Venter WD: Characteristics and outcomes of adult patients lost to follow-up at an antiretroviral treatment clinic in johannesburg, South Africa. J Acquir Immune Defic Syndr. 2008, 47: 101-107. 10.1097/QAI.0b013e31815b833a.View ArticlePubMedGoogle Scholar
- Rosen S, Fox MP, Gill CJ: Patient retention in antiretroviral therapy programs in sub-Saharan Africa: a systematic review. PLoS Med. 2007, 4: e298-10.1371/journal.pmed.0040298.View ArticlePubMedPubMed CentralGoogle Scholar
- Bisson GP, Gaolathe T, Gross R, Rollins C, Bellamy S, Mogorosi M, Avalos A, Friedman H, Dickinson D, Frank I, Ndwapi N: Overestimates of survival after HAART: implications for global scale-up efforts. PLoS One. 2008, 3: e1725-10.1371/journal.pone.0001725.View ArticlePubMedPubMed CentralGoogle Scholar
- Yiannoutsos CT, An MW, Frangakis CE, Musick BS, Braitstein P, Wools-Kaloustian K, Ochieng D, Martin JN, Bacon MC, Ochieng V, Kimaiyo S: Sampling-based approaches to improve estimation of mortality among patient dropouts: experience from a large PEPFAR-funded program in Western Kenya. PLoS One. 2008, 3: e3843-10.1371/journal.pone.0003843.View ArticlePubMedPubMed CentralGoogle Scholar
- Macpherson P, Moshabela M, Martinson N, Pronyk P: Mortality and loss to follow-up among HAART initiators in rural South Africa. Trans R Soc Trop Med Hyg. 2009, 103: 588-93. 10.1016/j.trstmh.2008.10.001.View ArticlePubMedGoogle Scholar
- Lawn SD, Myer L, Edwards D, Bekker LG, Wood R: Short-term and long-term risk of tuberculosis associated with CD4 cell recovery during antiretroviral therapy in South Africa. AIDS. 2009, 23: 1717-1725. 10.1097/QAD.0b013e32832d3b6d.View ArticlePubMedPubMed CentralGoogle Scholar
- Innes CS, Pemba L, Bogoshi M, Whetham J, Senoge S, Seatlanyane P, Fielding K, Churchyard GJ, Grant AD: Causes of mortality in patients on antiretroviral therapy in South Africa. 3rd South African AIDS Conference [abstract 698] (oral presentation). 2007Google Scholar
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