After the 2007 introduction of a policy to subsidize maternal health user fees in Burkina Faso, the rate of skilled birth attendance increased among women across all socioeconomic status strata. According to a quasi-experimental study conducted in 2008-2010, the increase was sustained for two years and was most pronounced among the poorest women. (1) For example, among women in the lowest socioeconomic stratum, the rate of skilled birth attendance was an estimated 45% higher immediately after program implementation than it would have been had the subsidy policy not been introduced (rate ratio, 1.5); the rates 6-24 months after implementation were an estimated 46-48% higher than they would have been in the absence of the subsidy (1.5 each). Among women in the highest socioeconomic stratum, the rates of skilled birth attendance were an estimated 19-21% higher 0-24 months after program implementation (1.2 each). In 2007, in an effort to promote facility-based skilled birth attendance, the government of Burkina Faso began to subsidize 80-100% of the direct costs related to delivering in a health facility. Given, however, that the literature on the effects of such subsidies is both limited and contradictory, researchers sought to examine the effects of user-fee subsidies on skilled birth attendance across socioeconomic strata. For their study, they used data from two population-based surveys conducted in the Hounde and Ziniare health districts in 2008 and 2010, and from a 2010 survey of the 27 primary health centers in the study area. Women were eligible for the population surveys if they were aged 15-49 and had given birth in the previous five years for the 2008 survey or in the previous two years for the 2010 survey; the period of observation covered 50 months before the introduction of the subsidy through 41 months postintroduction. In all, 1,408 women participated in the 2008 survey and 1,403 participated in 2010; 74% of all women participated in both. The population surveys collected data on the social, demographic and economic characteristics of the women and their households, their health-seeking behavior during pregnancy and delivery, and the timing and conditions of delivery. The facilities survey assessed the quality of care at the primary health centers in the study area by examining their number and mix of staff, medical equipment and infrastructures, including access to water. The researchers calculated descriptive statistics for the women, and used modified Poisson regression analyses to determine the rate ratios and rate differences for the associations between the introduction of the subsidy and skilled birth attendance over time, across socioeconomic status. Also, they estimated expected rates of skilled birth attendance for 2007 and beyond under the counterfactual scenario of no subsidy introduction to enable causal interpretation of the estimated rate changes. …