Table 3.

Secondary Outcomes.^*

Outcome	Intervention	Control	Relative Risk with Intervention (95% CI)†	P Value
	no./total no. (%)
ICU mortality
All patients	154/820 (19)	139/778 (18)	1.07 (0.90–1.28)	0.45
Patients admitted at night	90/500 (18)	81/470 (17)	1.02 (0.82–1.27)	0.88
Hospital mortality
All patients	203/820 (25)	177/778 (23)	1.08 (0.93–1.25)	0.33
Patients admitted at night	122/500 (24)	103/470 (22)	1.06 (0.88–1.28)	0.51
Discharge home from the hospital
All patients	317/820 (39)	314/778 (40)	0.95 (0.85–1.07)	0.41
Patients admitted at night	190/500 (38)	197/470 (42)	0.94 (0.82–1.09)	0.44
ICU readmission within 48 hr‡
All patients	32/602 (5)	21/630 (3)	1.56 (0.84–2.89)	0.16
Patients discharged at night	20/324 (6)	14/356 (4)	1.36 (0.53–3.47)	0.52

^*For all secondary outcomes except for readmissions, the exposure to intervention or control staffing was considered to be the exposure to the staffing model that was in place on the day of admission. For readmissions, the exposure to intervention or control was considered to be the exposure to the staffing model that was in place at time of discharge or, for daytime discharges, during the preceding night. Night admissions were considered to be admissions between 5:00 p.m. and 4:59 a.m. The reference for all the analyses is the control group.

^†A relative risk of more than 1 indicates that a greater proportion of patients in the intervention group had the outcome, whereas a relative risk of less than 1 indicates that a greater proportion of patients in the control group had the outcome.

^‡The analyses of ICU readmissions were restricted to patients who were discharged to floor locations within the hospital.