http://www.biomedcentral.com/1471-2458/15/129/abstract

BMC Public Health | Abstract | The effectiveness of community engagement in public health interventions for disadvantaged groups: a meta-analysis
Inequalities in health are acknowledged in many developed countries, whereby disadvantaged groups systematically suffer from worse health outcomes such as lower life expectancy than non-disadvantaged groups. Engaging members of disadvantaged communities in public health initiatives has been suggested as a way to reduce health inequities. This systematic review was conducted to evaluate the effectiveness of public health interventions that engage the community on a range of health outcomes across diverse health issues.