Table 4 Patient, Procedure and Facility Characteristics Associated with Receiving Prolonged Prophylactic Antimicrobials among 153,097 VA Outpatient Surgeries from FY16–17

Complex HOPD

Ref

Ref

 ASC

1 (0.89–1.12)

1.32 (1.16–1.49)

 Standard HOPD

1.51 (1.31–1.74)

1.34 (1.16–1.55)

 Intermediate HOPD

1.67 (1.59–1.77)

1.74 (1.64–1.85)

Age: 20–60 years

1.17 (1.07–1.27)

 61–67 years

1.01 (0.93–1.09)

 68–70 years

1.09 (1.01–1.19)

 71–76 years

1.03 (0.94–1.12)

 77–100 years

Ref

Female

1.2 (1.08–1.34)

White

1.1 (1.04–1.17)

Relative value unit: 0.5–1.4 RVUs

Ref

 1.5–2.8 RVUs

4.03 (3.47–4.68)

 2.8–6.4 RVUs

5.83 (5.04–6.75)

 6.5–8.5 RVUs

6.27 (5.38–7.31)

 8.5–23.5 RVUs

4.49 (3.83–5.26)

Surgical specialty: Orthopedics

Ref

 Eye

0.15 (0.12–0.17)

 Genitourinary

4.94 (4.51–5.41)

 Ear/Nose/Throat

4.19 (3.79–4.63)

 General Surgery

0.16 (0.13–0.2)

C-statistic

0.544

0.836

Max likelihood estimate intercept (std. dev)

−3.05 (0.01)***

−5.31 (0.1)***