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Table 2 Multiple Regression Analysis

From: Prospective randomized study evaluating the usefulness of a surgical smoke evacuation system in operating rooms for breast surgery

Results – Formaldehyde

Surgeons

β (coefficient)

p-value

Constant

4.578

0.000

Evacuation system used

-1.647

0.000

Decision variable (adjusted R2)

0.253

 

Surgical assistants

β (coefficient)

p-value

Constant

4.684

0.000

Evacuation system used

-1.506

0.001

Decision variable (adjusted R2)

0.158

 

Anesthetists

β (coefficient)

p-value

Constant

4.899

0.000

Evacuation system used

-1.932

0.000

Total mastectomy

-0.952

0.014

Decision variable (adjusted R2)

0.329

 

Scrub nurses

β (coefficient)

p-value

Constant

4.228

0.000

Evacuation system used

-1.117

0.025

Decision variable (adjusted R2)

0.066

 

Circulating nurses

β (coefficient)

p-value

Constant

3.353

0.000

Evacuation system used

-1.182

0.007

Anesthetic

1.013

0.025

Decision variable (adjusted R2)

0.144

 

Results - Acetaldehyde

Surgeons

β (coefficient)

p-value

Constant

12.439

0.000

Evacuation system used

-2.69

0.003

Operating time (min.)

-0.039

0.009

Surgeon’s years of experience

-0.086

0.043

Decision variable (adjusted R2)

0.218

 

Surgical assistants

β (coefficient)

p-value

Constant

12.338

0.000

Fresh air volume

-0.005

0.010

Operating time (min.)

-0.024

0.034

Evacuation system used

-1.376

0.049

Decision variable (adjusted R2)

0.198

 

Anesthetists

β (coefficient)

p-value

Constant

6.915

0.000

Evacuation system used

-3.99

0.000

Anesthetic

1.921

0.014

Decision variable (adjusted R2)

0.257

 

Scrub nurses

β (coefficient)

p-value

Constant

5.957

0.000

Evacuation system used

-1.765

0.014

Decision variable (adjusted R2)

0.082

 

Circulating nurses

β (coefficient)

p-value

Constant

10.084

0.000

Operating time (min.)

-0.041

0.024

Decision variable (adjusted R2)

0.067

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