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Background  Resident competence in peri-operative care is a reflection on education and cost-efficiency. Inspecting pre-existing operating room metrics for performance outliers may be a potential solution for assessing competence. Statistical correlation of problematic benchmarks may reveal future opportunities for educational intervention.    Methods  Case-log database review yielded 3071 surgical cases involving residents over the course of 5 years. Surgery anticipated and actual start times were evaluated for delays and residents were assessed using the days of resident training performed at the time of each corresponding case. Other variables recorded included day of week, attending anesthesiologist name, attending surgeon name, patient age, sex, American Society of Anesthesiologists physical status classification (ASA PS), and in-patient versus day surgery status. Mixed-effect, multi-variable, linear regression determined independent determinants of delay time.    Results  The analysis identified day of the week (F = 25.65,  P  < 0.0001), days of training (F = 8.39,  P  = 0.0038), attending surgeon (F = 2.67,  P  < 0.0001), and anesthesiology resident (F = 1.67,  P  = 0.0012) as independent predictors of delay time for first-start cases, with an overall regression model F = 3.09, r 2  = 0.186, and  P  < 0.0001.    Conclusions  The day of the week and attending surgeon demonstrated significant impact of case delay compared to resident days trained. If a learning curve for first-case start punctuality exists for anesthesiology residents, it is subtle and irrelevant to operating room efficiency. The regression model accounted for only 19% of the variability in the outcome of delay time, indicating a multitude of additional unidentified factors contributing to operating room efficiency.

Operating room first case start times: a metric to assess systems-based practice milestones?