Table 2.

Adjusted odds of an adverse event following outpatient surgery.

Covariate	Odds Ratio (95% Confidence Interval)			30-Day Mortality
	Same-Day Admission	Subsequent Admission	Postoperative Complication
Location of care
HOPD*	1.00 (--)	1.00 (--)	1.00 (--)	1.00 (--)
ASC	6.96 (4.44 – 10.90)	0.94 (0.88 – 1.01)	0.69 (0.57 – 0.83)	0.92 (0.61 – 1.39)
Office	3.64 (2.48 – 5.36)	0.97 (0.94 – 1.02)	0.91 (0.82 – 1.00)	0.98 (0.79 – 1.21)
Age
65 – 74*	1.00 (--)	1.00 (--)	1.00 (--)	1.00 (--)
75 – 84	1.51 (1.28 – 1.78)	1.30 (1.26 – 1.34)	1.22 (1.13 – 1.31)	1.18 (0.98 – 1.43)
≥85	2.75 (2.25 – 3.36)	1.70 (1.63 – 1.77)	1.23 (1.10 – 1.38)	1.91 (1.55 – 2.34)
Gender
Male*	1.00 (--)	1.00 (--)	1.00 (--)	1.00 (--)
Female	0.66 (0.56 – 0.78)	0.83 (0.80 – 0.85)	0.70 (0.64 – 0.75)	0.95 (0.80 – 1.12)
Race
White*	1.00 (--)	1.00 (--)	1.00 (--)	1.00 (--)
Black	1.13 (0.85 – 1.50)	0.97 (0.91 – 1.02)	0.97 (0.84 – 1.12)	0.82 (0.59 – 1.15)
Other	0.53 (0.33 – 0.86)	0.86 (0.80 – 0.93)	0.91 (0.76 – 1.09)	0.83 (0.53 – 1.32)
Charlson score
0*	1.00 (--)	1.00 (--)	1.00 (--)	1.00 (--)
1	2.33 (1.98 – 2.73)	1.35 (1.31 – 1.39)	1.26 (1.17 – 1.36)	1.67 (1.41 – 1.99)
≥2	4.18 (3.38 – 5.18)	2.38 (2.28 – 2.49)	1.81 (1.61 – 2.03)	3.21 (2.62 – 3.92)
Area of residence
West*	1.00 (--)	1.00 (--)	1.00 (--)	1.00 (--)
South	0.99 (0.80 – 1.24)	1.06 (1.02 – 1.11)	0.86 (0.78 – 0.95)	0.97 (0.77 – 1.22)
Midwest	1.11 (0.87 – 1.40)	1.09 (1.04 – 1.14)	0.94 (0.84 – 1.04)	0.97 (0.76 – 1.25)
Northeast	0.89 (0.69 – 1.15)	0.86 (0.82 – 0.91)	0.73 (0.65 – 0.82)	0.97 (0.75 – 1.26)

Abbreviations: ASC, ambulatory surgery center; CI, confidence interval; HOPD, hospital outpatient department; OR, odds ratio.

^*Indicates referent group.

Shaded table cells denote statistically significant associations.