. Author manuscript; available in PMC: 2010 Apr 1.

Published in final edited form as: J Hosp Med. 2009 Oct;4(8):E1–E9. doi: 10.1002/jhm.527

Table 4.

Multivariable Analysis for Inpatient Medical Complications among 1,180 Olmsted County, Minnesota, Residents Undergoing Urgent Hip Fracture Repair, 1988–2002

	Underweight	Normal	Overweight	Obese	Age^#	Male Sex^#	Surgical Year^#	ASA Score	COPD/Asthma
	< 18.5kg/m²	18.5–24.9kg/m²	25–29.9kg/m²	≥30kg/m²				III–V vs. I/II
	^‡ n=184	^‡ n=640	^‡ n=251	^‡ n=105
^# Model 1a	1.25 (0.89–1.74)	Referent	0.97 (0.72–1.31)	1.16 (0.76–1.76)	---	---	---	---	---
Model 1b	1.26 (0.90–1.77)	Referent	1.05 (0.77–1.43)	1.38 (0.90–2.13)	1.04 (1.02–1.06)^*		---	---	---
Model 1c	1.30 (0.93–1.83)	Referent	0.93 (0.68–1.26)	1.12 (0.73–1.71)	---	1.47 (1.09–1.98)^*	---	---	---
Model 1d	1.28 (0.91–1.79)	Referent	0.97 (0.71–1.31)	1.13 (0.74–1.73)	---	---	1.03 (1.00–1.06)	---	---
Model 1e	1.23 (0.88–1.72)	Referent	1.00 (0.73–1.36)	1.13 (0.74–1.73)	---	---	---	2.22 (1.52–3.24)^*	---

^† Model 2	1.33 (0.95–1.88)	Referent	1.01 (0.74–1.38)	1.28 (0.82–1.98)	1.04 (1.02–1.06)^*	1.59 (1.17–2.17)^*	1.02 (0.99–1.05)	1.89 (1.28–2.79)^*	---

^§ Model 3	1.30 (0.92–1.84)	Referent	1.04 (0.76–1.42)	1.30 (0.84–2.02)	1.05 (1.03–1.06)^*	1.52 (1.11–2.07)^*	1.02 (0.99–1.05)	1.77 (1.20–2.62)^*	1.58 (1.17–2.12)^*

^¶ Model 4	---	---	---	---	1.05 (1.03–1.06)^*	1.49 (1.10–2.02)^*	---	1.84 (1.25–2.71)^*	1.58 (1.18–2.12)^*

Each row represents a separate multivariable logistic regression analysis. All values listed as Hazard Ratios (95% Confidence Intervals)

^‡

The number of observed number of fractures in this category

Model 1 - Effect of BMI category (underweight, normal, overweight and obese) on overall non-cardiac inpatient complication rate adjusted, a priori individually,, for age, sex, surgical year, and ASA score univariately.

^†

Model 2 - Effect of BMI category (underweight, normal, overweight and obese) on overall non-cardiac inpatient complication rate, after adjusting for age, sex, surgical year, American Society of Anesthesia Class.

^§

Model 3 - Model evaluating other potential risk factors, including baseline demographic and baseline clinical variables that were significant (p<0.05) univariately using stepwise selection. Model includes body mass index as a categorical variable (underweight, normal, overweight and obese), adjusted for age, sex, surgical year, American Society of Anesthesia Class.

^¶

Model 4 - Model evaluating other potential risk factors, including baseline demographic and baseline clinical variables that were significant (p<0.05) univariately using stepwise selection. Model 3 is similar to this, but does not force body mass index in.

P<0.05

Abbreviations: ASA–American Society of Anesthesia; COPD–Chronic Obstructive Pulmonary Disease