Table 5. Timing and Etiologic Characteristics Assessed as Potential Predictors of Survival after Cardiac Arrest during Anesthesia

* Because of missing data, the numbers of patients within categories of a given characteristic may not sum to 223.

†P  values from logistic regression assessing the univariate association of the given characteristic with immediate ≥ 1 h and hospital survival. For this analysis, all characteristics were treated as classification variables using the categories indicated.

‡ Standard working hours were 07:00–20:00, Monday through Friday.