. Author manuscript; available in PMC: 2021 Sep 16.

Published in final edited form as: JAMA Surg. 2016 Dec 1;151(12):1187–1190. doi: 10.1001/jamasurg.2016.3113

Table 2:

Logistic Regression Results Predicting Postoperative Admissions in 26,019 VA Hernia Surgeries (FY12-14, 109 VA Hospitals, 14 VA ambulatory surgery centers (ASCs))

Significant Predictors	β Coefficent (Standard Error)	Odds Ratio (95% Confidence Interval)
ASC	−0.11 (0.25)	0.9 (0.56-1.45)
Age 1^st quintile	REF	REF
5^th quintile	0.82 (0.19)	2.27 (1.55-3.33)
Distance (miles) to nearest VA Medical Center 1^st quintile	REF	REF
5^th quintile	−0.4 (0.19)	0.67 (0.46-0.97)
FY12 area median per capita income (US Dollars) 1^st quintile	REF	REF
3^rd quintile	−0.41 (0.18)	0.66 (0.47-0.94)
No comorbidities	REF	REF
Patient # of comorbidities =4	0.71 (0.36)	2.04 (1.01-4.14)
Patient # of comorbidities =6	0.95 (0.47)	2.6 (1.04-6.48)
Cardiac arrhythmia	0.43 (0.13)	1.53 (1.19-1.97)
Duration of Surgery 1^st quintile	REF	REF
5^th quintile	0.9 (0.16)	2.46 (1.79-3.39)
FY12 hospital beds in area 1^st quintile	REF	REF
2^nd quintile	−0.35 (0.17)	0.71 (0.51-0.98)
Surgery performed in Oct FY12	REF	REF
Surgery performed in Feb FY14	−1.35 (0.59)	0.26 (0.08-0.82)

Note: Bolded value indicates significant variable in model. Model performance: pseudo r²=0.09, c-statistic=0.76. Predictors in the logistic regression model that were not significantly associated with postoperative admission include: sex, race, age quintiles 2-4, service connected disability, distance from VAMC quintiles 2-4, FY12 area median per capita income 2^nd, 4^th and 5^th quintile, patient with 1-3, 5, 7 total comorbidities, individual comorbidities (e.g., AIDS) excepting cardiac arrhythmia, duration of surgery quintiles 2-4, ASA score, facility surgical volume, FY12 area hospital bed supply quintiles 3-5, facility’s geographic region, and month/years of the hernia surgery Nov FY12 – Sep FY14 excepting Feb FY14.