Results Most interventions combined microfinance with health education , which demonstrated positive effects on health knowledge and behaviours , though not health status .
Interventions combining multiple health components in a given study demonstrated positive effects , though it was unclear which component was driving the effect .
Discussion Integrated microfinance and health education programs were effective , though longer intervention periods are necessary to measure more complex pathways to health status .
The effect of microfinance combined with other health components was less clear .
Background Solutions delivered within firm sectoral boundaries are inadequate in achieving income security and better health for poor population s.  Integrated microfinance and health interventions leverage networks of women to promote financial inclusion , build livelihoods , and safeguard against high cost illnesses .
Our underst and ing of the effect of integrated interventions has been limited by variability in intervention , outcome , design , and method ological rigour .
This systematic review synthesis es the literature through 2015 to underst and the effect of  integrated microfinance and health programs .
Pitfalls of and controversies in cluster randomization trials.
It is now well known that st and ard statistical procedures become invali date d when applied to cluster r and omized trials in which the unit of inference is the individual . A result ing consequence is that research ers conducting such trials are faced with a multitude of design choices , including selection of the primary unit of inference , the degree to which clusters should be matched or stratified by prognostic factors at baseline , and decisions related to cluster subsampling . Moreover , application of ethical principles developed for individually r and omized trials may also require modification . We discuss several topics related to these issues , with emphasis on the choices that must be made in the planning stages of a trial and on some potential pitfalls to be avoided
Results Most interventions combined microfinance with health education , which demonstrated positive effects on health knowledge and behaviours , though not health status .
Interventions combining multiple health components in a given study demonstrated positive effects , though it was unclear which component was driving the effect .
Discussion Integrated microfinance and health education programs were effective , though longer intervention periods are necessary to measure more complex pathways to health status .
The effect of microfinance combined with other health components was less clear .
Background Solutions delivered within firm sectoral boundaries are inadequate in achieving income security and better health for poor population s.  Integrated microfinance and health interventions leverage networks of women to promote financial inclusion , build livelihoods , and safeguard against high cost illnesses .
Our underst and ing of the effect of integrated interventions has been limited by variability in intervention , outcome , design , and method ological rigour .
This systematic review synthesis es the literature through 2015 to underst and the effect of  integrated microfinance and health programs .