Patient, tumour and surgery-related variables and method of collection
| Variable category | Variables | Collection methods for study and historical data |
| Patient related | Sex, age, diagnosis, height, weight, tumour location, stage and TNM category, tobacco and alcohol use, ASA score, performance status, Charlson Comorbidity Index score | Danish Colorectal Cancer Group database |
| Socioeconomic and demographic data | Statistics Denmark | |
| Disease related | Screening status, polyp histology, localisation of polyp, reason for choice of conservative management as registered in the database | Danish Colorectal Cancer Group database |
| Histopathological risk factors according to national guidelines | National Pathology Database | |
| Surgery related | Operative approach, procedure, reason for surgical subsequent bowel resection | Danish Colorectal Cancer Group database |
| Outcome of subsequent bowel resection according to national guidelines | National Pathology Database |
ASA, American Society of Anesthesiologists; TNM, Tumour, Node, Metastasis.