Table 3– Crude and adjusted hazard ratios (HRs) of in-hospital death according to the day of admission and the day of stay, estimated by Cox proportional hazards model
Day of admissionDay of stay
Crude HRAdjusted# HR (95% CI)Crude HRAdjusted# HR (95% CI)
Weekday (reference)1.001.00 (reference)1.001.00 (reference)
Friday0.980.97 (0.95–1.00)1.051.05 (1.02–1.08)
Weekend1.061.06 (1.03–1.09)1.071.07 (1.04–1.09)
  • #: for age, sex, calendar year of admission, admission day (weekday, Friday or weekend), prior hospitalisation and the modified chronic disease score divided into quartiles with a fifth category to account for subjects with no medication information in the year prior to cohort entry; : Monday–Thursday inclusive.