During the study period, the rate of incident pregnancy among HIV-infected women was 5.5 per 100 woman years within integrated sites and 6.1 per 100 woman years within nonintegrated sites. This difference was not statistically significant  but corresponds to 227 incident pregnancies within integrated sites and 209 incident pregnancies within nonintegrated sites. If women in integrated sites had a rate of incident pregnancy that was similar to that observed in nonintervention sites, then we would have observed 252 incident pregnancies. Therefore, the intervention was associated with 25 fewer pregnancies at a marginal cost of $1368.03 per incident pregnancy averted.
Cost-efficiency by clinic size
We observed substantial economies of scale in the incremental cost per additional use of more effective family planning among HIV-infected women (Fig. 1). Cost per woman decreased more with increasing clinic size within integrated sites [Y = 32.83(exp(−0.002X))] compared with nonintegrated sites [Y = 15.83(exp(−0.001X))]. We observed similar relationships in cost per additional woman using more effective family planning. Cost per additional woman using more effective family planning decreased more with increasing clinic size within integrated sites [Y = 269.27(exp(−0.003X))] compared with nonintegrated sites [Y = 107.67(exp(−0.00004X))].
Integration of family planning into HIV services is a cost-efficient way to increase the delivery of family planning services to HIV-infected women in this setting. The cost of family planning associated with integration in this study was well within the range of previously published estimates for the cost of provision of family planning services ($6–113) [23,24]. In addition, the efficacy of integration was found to be higher than estimates used in previous modeling efforts (20 vs. 10% increase in the use of family planning) . These estimates of cost and efficiency result in a marginal cost of $65 per additional woman using more effective family planning.
Costs associated with integration were predominantly associated with personnel, including training, mentoring and supervision. Although costs tended to be higher within integrated and larger sites, several factors, including distance, staff turnover and infrastructure, affected the level of effort needed to facilitate service delivery and integration, and therefore costs in each category at each site. These results suggest the need for ongoing support for integration of family planning into HIV care. They also suggest the need to identify efficiencies in training, mentoring and supervision.
We observed substantial economies of scale in the integration of family planning into HIV care. For example, within smaller sites (e.g. size = 200), integration was associated with an additional cost of $9 per HIV-infected woman and an additional cost of $41 per additional use of more effective family planning. In contrast, within larger sites (e.g. size = 800), integration was associated with cost savings of $0.48 per HIV-infected woman and cost savings of $80 per additional use of more effective family planning. These results reflect the broader distribution of personnel resources over a greater patient population in larger settings.
This study has several limitations, which affect the generalizability of findings. First, the setting of the study in Nyanza Province and the relatively small sample size of the study limit broader applicability. Second, both integrated and nonintegrated sites received training and ongoing mentoring. Therefore, our findings were based solely on whether health facilities provided integrated rather than nonintegrated family planning and HIV services. Third, we were not able to measure changes in activities among clinic staff and patients. Previous reviews of the literature have suggested that integration places additional strain on health personnel [12–15]. Thus, the integration process and the provision of family planning together with HIV services may place an additional burden on healthcare providers. Fourth, this study was not powered to detect a statistically significant difference in the rate of pregnancy. Therefore, we were not able to establish whether this intervention was cost-effective with respect to averted pregnancies.
Taken together, these results reinforce the prioritization of integration of family planning and HIV services, particularly within larger health facilities . Integration will depend on high quality training of all clinic personnel in patient education and provision of family planning methods, as well as sustained mentoring and supervision of clinical personnel in integrated health facilities. The allocation of resources toward a more comprehensive approach to reproductive health among HIV-infected women has the potential to not only benefit the lives of HIV-infected women and their families, but also to enhance the economic and social environment of the country as a whole.
S.B.S. participated in study design, conducted cost data collection site visits, supervised data management and analysis of both cost and outcome data, and led writing of the manuscript. S.K. led design of cost component of the study, conducted the cost data collection site visits, conducted analysis of cost data and drafted the article. M.O. coordinated all aspects of study implementation and monitoring, contributed to data interpretation and writing. G.O. was responsible for management of all cost data in-country and participated in interpretation of costing data and writing. R.L.S. performed literature search, developed study and training materials, monitored study, contributed to writing. D.G. originated and supervised the overall trial, participated in study site training, led study design, and contributed to data interpretation and writing. S.J.N. contributed to study design, training, data interpretation and writing. C.B. led data management and analysis of outcome data and contributed to writing. E.A.B. supervised training and data collection and contributed to data interpretation and writing. C.R.C. supervised all aspects of study, including development of the study design, analysis, and writing of the manuscript.
We thank the Kenyan women and men who participated in the study. We acknowledge the important logistical support of the KEMRI-UCSF Collaborative Group and especially Family AIDS Care and Education Services (FACES). We gratefully acknowledge the Director of KEMRI, the Director of KEMRI's Centre for Microbiology, and the Nyanza Provincial Ministries of Health for their support in conducting this research. We also thank Norah Bett, Catherine Amayo, Christine Auma, Beatrice Hongo, Rose Odeny, Elizabeth Onyango, Gorrety Akinyi Ong’udi, Shiko Kingori, Katie D. Schwartz, Harriette Sande, Pauline Wekesa, Janet Opala, Christine Alindi, Violet Nasenya, Micahel Onyalo, Mercy Njuguna, Kevin Owuor, Benard Otieno, Charles Kibaara, Jane Ivory Ernstthal, Meghan Flanagan, the data clerks, the Community and Clinic Health Assistants, and the Community Advisory Group members for their important contributions to this research.
Conflicts of interest
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the article.
This work was supported by The Bill & Melinda Gates Foundation (http://http://www.gatesfoundation.org/, grant number OPPGH5361), and the Tides Africa Fund (http://http://www.tides.org/impact/fund-initiative-spotlight/tides-africa-fund/, grant numbers TFR10–01364 and TFR08–02986). Dr Newmann was supported by the National Center for Advancing Translational Sciences, National Institutes of Health, through UCSF-CTSI grant number KL2TR000143.
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Keywords:© 2013 Lippincott Williams & Wilkins, Inc.
cost-effectiveness; family planning; HIV; integration; kenya