Table 4.

Results of Secondary Analyses (Odds Ratios and 95% Confidence Intervals)^*

Variable	Primary Analysis (N = 757)†	Excluding Patients with Preexisting PrUs (N = 694)	Limiting Cases to Definitely Hospital-Acquired PrUs (N = 757)	Limiting Cases to Stage 2 or Higher PrUs (N = 735)
ED stay ≥8 h	0.8 (0.5–1.2)	0.8 (0.5–1.3)	1.0 (0.6–1.6)	0.8 (0.5–1.3)
Any potentially immobilizing procedure in ED	1.3 (0.7–2.6)	1.1 (0.5–2.3)	1.2 (0.5–2.5)	0.7 (0.3–1.6)
Any potentially immobilizing medication in ED	1.2 (0.7–2.2)	1.3 (0.7–2.3)	1.3 (0.7–2.6)	1.4 (0.7–2.7)
Night arrival in the ED	1.1 (0.5–2.3)	1.5 (0.6–3.5)	1.4 (0.6–3.1)	1.2 (0.5–2.9)
Number of weekend days
0	Reference	Reference	Reference	Reference
1	0.9 (0.5–1.4)	1.0 (0.6–1.6)	1.0 (0.6–1.7)	1.0 (0.6–1.6)
2	1.1 (0.6–1.9)	1.2 (0.6–2.2)	1.1 (0.5–2.2)	1.3 (0.7–2.6)
Any surgical, radiologic, cardiologic or invasive procedure in the inpatient period	0.9 (0.5–1.5)	0.8 (0.4–1.4)	0.9 (0.5–1.8)	0.9 (0.5–1.7)
Any restraining, immobilizing or compression device in the inpatient period	1.5 (0.7–2.9)	1.9 (0.9–4.0)	1.0 (0.5–2.3)	1.3 (0.6–2.8)
ICU stay	2.0 (1.2–3.5)	2.2 (1.3–4.0)	1.7 (0.9–3.2)	2.2 (1.2–4.1)
Any potentially immobilizing medication (inpatient)	0.6 (0.3–0.9)	0.6 (0.4–1.1)	0.6 (0.3–1.1)	0.6 (0.3–1.2)

Notes:

^*All results were obtained by conditional logistic regression within strata of matching factors (hospital and 6-month time period) and adjusting for age, sex, race, Medicaid coverage, incontinence, confusion/delirium, risk of nutrition-related complications, functional impairment, nursing home residence before hospital admission, and Charlson comorbidity score.

^†Same as adjusted results in Table 3, presented for purpose of comparison with secondary analyses.

PrU = pressure ulcer; ED = emergency department; ICU = intensive care unit.