Table 4.

Effects of hospital nursing on 30- and 10-day unplanned readmission

	Unadjusted	Adjusted for patient characteristics	Adjusted for hospital and patient characteristics
	OR (95% CI)	OR (95% CI)	OR (95% CI)
30-Day readmission
Staffing	1.10** (1.04–1.17)	1.08** (1.02–1.15)	1.08* (1.02–1.15)
Work environment	0.84** (0.74–0.95)	0.86* (0.76–0.98)	0.88* (0.77–0.99)
10-Day readmission
Staffing	1.12* (1.03–1.22)	1.10* (1.01–1.20)	1.12* (1.02–1.23)
Work environment	0.83* (0.69–0.99)	0.86 (0.71–1.13)	0.86 (0.71–1.04)

Nurse staffing indicates a ratio of the number of patients to the number of registered nurses. Patient characteristics include: age, sex, comorbidities, type of surgery, number of procedures. Hospital characteristics include: hospital size, teaching status, technology status. All of the models account for clustering of patients within hospitals.

*P < 0.05; **P < 0.01.