In China, health care providers have traditionally been paid fee-for-service and overprescribing and high out-of-pocket spending are common. In this study, township health centers in two counties were assigned almost randomly to two groups: in one, fee-for-service was replaced by a global capitated budget
in the other, by a mix of global capitated budget and pay-for-performance. Performance captured inter alia "irrational" drug prescribing
20 percent of the global capitated budget was withheld each quarter, points were deducted for failure to meet targets, and some of the withheld budget was returned in line with the points deducted. Outcomes included appropriate prescribing and prescription cost, data on which were obtained by digitizing prescriptions from a month just before the reform and from the same month a year later. Impacts were assessed via multivariate differences-in-differences with township health center fixed effects. To reduce bias from non-randomness in assignment, the sample was trimmed by coarsened exact matching. Pay-for-performance reduced inappropriate prescribing significantly and substantially in the county where the initial level was above the penalty threshold, but end-line rates were still appreciable
no effects were seen in the county where initial levels were around or below the threshold, or on out-of-pocket spending in either county.