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Table 3 Summary of the characteristics and units of measurement

From: Productivity in relation to organization of a surgical department: a retrospective observational study

Covariate

Description

Age

Patient age (years)

BMI

Body mass index (kg/m2)

ASA score

American Society of Anesthesiologists’ physical status classification (ASA 1–4)

Patient sex

Male or female

Total number of personnela

The total number of personnel present any time during of the operation (n)

Surgical trainee present

If a surgical trainee or surgical assistant is present during the operation (Yes/No)

Total number of studentsa

The total number of students present any time during of the operation (n)

Medical/nursing student presenta

If a medical or nursing student is present during the operation (Yes/No)

Procedure group 1

If the patient is undergoing an extensive surgical procedure for breast cancer (Yes/No)

Procedure group 2

If the patient is undergoing a limited surgical procedure for breast cancer (Yes/No)

Procedure group 3

If the patient is undergoing a surgical procedure for malignant melanoma (Yes/No)

Consultant present

Main surgeon is a consultant (Yes/No)

High-volume surgeon present

If the main surgeon performs > 50 procedures/year (Yes/No)

  1. aCovariates not used in the analysis