Estimating Heterogeneity in the Benefits of Medical Treatment Intensity
利用1990年代末立法变化导致的产后住院时间延长，识别增加医院护理对新生儿健康的影响，发现平均影响温和，但对高再入院风险婴儿效果显著。
We exploit increases in postpartum length of stay generated by legislative changes in the late 1990s to identify the impact of greater hospital care on the health of newborns. Using all births in California over the 1995–2000 period, two-stage least-square estimates show that increased treatment intensity had a modest impact on readmission probabilities for the average newborn. Allowing the treatment effect to vary by two objective measures of medical need demonstrates that the law had large impacts for those with the greatest likelihood of a readmission. The results suggest that the returns to average and marginal patients vary considerably in this context. © 2012 The President and Fellows of Harvard College and the Massachusetts Institute of Technology.