title: Sampling time error in EuroSCORE II.
abstract: Seasonal variation in mortality after cardiac surgery exists. EuroSCORE II accrued data over a 12-week period from May to July 2010. We investigated whether the accrual period for EuroSCORE II had a different mortality rate compared with the rest of the year. We found in a study population of 18,706 that the accrual period of EuroSCORE II may introduce bias into the predicted mortality, potentially reducing the accuracy of the new model.
authors.affiliation: Department of Cardiothoracic Surgery, Liverpool Heart and Chest Hospital, Liverpool, UK. mike.poullis@lhch.nhs.uk
authors.forename: Michael
authors.initials: M
authors.lastname: Poullis
authors.forename: Brian
authors.initials: B
authors.lastname: Fabri
authors.forename: Mark
authors.initials: M
authors.lastname: Pullan
authors.forename: John
authors.initials: J
authors.lastname: Chalmers
mesh_terms: D019985:Benchmarking; D006348:Cardiac Surgical Procedures / Q000009:adverse effects / Q000401:mortality*; D004739:England; D017052:Hospital Mortality / Q000639:trends; D006801:Humans; D016015:Logistic Models; D016017:Odds Ratio; D018570:Risk Assessment; D012307:Risk Factors; D012621:Seasons; D013997:Time Factors