Table 3 Matched Comparisons and Relative Risk of Adverse Event Rates that Occurred 72 h After Surgery in Spinal vs General Anesthesia for Outpatient Total Knee Arthroplasty

Death

1 (0.05)

1 (0.05)

0.00 (-0.14, 0.14)

1.00 (0.06, 15.98)

1.00

Sepsis/Septic shock

0 (0.00)

0 (0.00)

0.00 (-, -)

-

-

Unplanned intubation

2 (0.10)

0 (0.00)

0.10 (-0.04, 0.24)

-

0.15

On ventilator > 48 h

0 (0.00)

1 (0.05)

-0.05 (-0.15, 0.05)

-

0.31

Stroke/cerebrovascular accident

0 (0.00)

1 (0.05)

-0.05 (-0.15, 0.05)

-

0.31

Cardiac arrest

0 (0.00)

3 (0.15)

-0.15 (-0.33, 0.02)

-

0.08

Myocardial Infarction

0 (0.00)

3 (0.15)

-0.15 (-0.33, 0.02)

-

0.08

Renal failure

0 (0.00)

0 (0.00)

0.00 (-, -)

-

-

Thromboembolic event

6 (0.31)

7 (0.36)

-0.05 (-0.41, 0.31)

0.86 (0.29, 2.55)

0.78

Wound-related infection

1 (0.05)

0 (0.00)

0.05 (-0.05, 0.15)

-

0.31

Return to the operating room

4 (0.20)

8 (0.41)

-0.20 (-0.55, 0.14)

0.50 (0.15, 1.66)

0.24

Renal insufficiency

0 (0.00)

1 (0.05)

-0.05 (-0.15, 0.05)

-

0.31

Urinary tract infection

1 (0.05)

0 (0.00)

0.05 (-0.05, 0.15)

-

0.31

Wound dehiscence

1 (0.05)

2 (0.10)

-0.05 (-0.22, 0.12)

0.50 (0.05, 5.51)

0.56

Pneumonia

0 (0.00)

5 (0.25)

-0.25 (-0.48, -0.03)

-

0.02

Blood Transfusion

8 (0.41)

33 (1.68)

-1.27 (-1.91, -0.64)

0.24 (0.11, 0.52)

 < .001

Readmission

9 (0.46)

15 (0.78)

-0.32 (-0.81, 0.18)

0.59 (0.26, 1.35)

0.22

SAE

13 (0.66)

18 (0.92)

-0.25 (-0.81,0.30)

0.72 (0.35, 1.47)

0.36

MAE

10 (0.51)

41 (2.09)

-1.58 (-2.29, -0.87)

0.24 (0.12, 0.49)

 < .001

Any AE

20 (1.02)

57 (2.91)

-1.89 (-2.75, -1.02)

0.35 (0.21, 0.58)

 < .001

MAE (without transfusion)

2 (0.10)

8 (0.41)

-0.31 (-0.62, 0.01)

0.25 (0.05, 1.18)

0.058

Any AE (without transfusion)

15 (0.76)

24 (1.22)

-0.46 (-1.08,0.16)

0.63 (0.33, 1.19)

0.15