Letters COMMENT & RESPONSE and Injury Severity Score (ISS) to develop a propensity score to find matched data sets. The matching is based on covari- Error in Table in Defining Rates and Risk Factors ates that are not potential confounders rather than covariates for Readmissions Following Emergency that are potential confounders. Importantly, none of the vari- General Surgery ables used are indications for IVCF insertion. The authors did To the Editor The study “Defining Rates and Risk Factors for Re- not have the data detail in their registry or the resources to ex- admissions Following Emergency General Surgery” is an analy- tract the data required for appropriate matching. They have sis of the State Inpatient Database, a restricted-access, pub- somewhat mentioned this in the limitations. The authors’ po- licly available data set that is maintained by the Agency for sition seems to be that IVCF insertion is a random event. Healthcare Research and Quality (AHRQ). One of the provi- The authors perform regression analyses using age, sex, sions of the State Inpatient Database Data Use Agreement, race/ethnicity, ISS, and brain injury severity (using the head which was signed when purchasing the data, is that no data and neck Abbreviated
JAMA Surgery – American Medical Association
Published: Jul 22, 2017
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