Table 4

Adjusted ORs indicating the change in the odds of a patient death associated with below-target registered nurse (RN) staffing

Outcome: patient death
OR95% CIP value
Binary indicator of RN staffing below target by:
 4 hours or more1.04240.9257 to 1.17390.4927
 8 hours or more1.05870.9371 to 1.19610.3596
 12 hours or more1.09330.9508 to 1.25720.2108
 16 hours or more1.22821.0034 to 1.50350.0463
 20 hours or more1.26260.9841 to 1.61990.0667
 24 hours or more1.37011.0146 to 1.85010.0399
  • Results listed are from six separate conditional logistic regression models, each with ward fixed effects. Unit of analysis is the hospital ward-day (n=19 287). 95% CI, with SEs clustered at the hospital ward level. All models also control for the mean patient age; the patient age squared; the sex and ethnicity mix of patients; the mean Elixhauser Comorbidity Index; pairwise-interaction terms between mean age, sex, ethnicity and Elixhauser Comorbidity Index; the mean hospital length of stay of patients treated in the ward that day; the number of patients treated in the ward that day; a dummy for each day of the week; a dummy for month of the year and a dummy indicating whether the day was a bank holiday. Target RN staffing is defined as the total number of rostered hours for RNs (those in band 5 or above), which is equal to the sum of filled and unfilled hours.