... years of the NIS available at the time of ourstudy. The NIS is the large st all-payer inpatient caredatabase in the United States and contains data fromapproximately 8 million hospital stays ... Additionally, this study exami ned onlyUS hospitals; thus, results may not be relevant outside the US setting. Also, only inpatient stays were examined,so results of this analysis may not be ... another facility,other, missing), admission type (emergency, urgent, elec-tive, newborn, other, missing), discharge disposition(routine, short-term hospital, skilled-nursing facility,intermediate...