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) |