1 = Male
2 = Female

Clinical stage at diagnosis
0 = Unknown
1 = Localised
2 = Regional
3 = Distant

Vital status at last contact
0 = Alive
1 = Dead: cancer
2 = Dead: other
4 = Lost to follow-up

Anatomical subsite of tumour
1 = Coecum and ascending
2 = Transverse
3 = Descending and sigmoid
4 = Other and NOS

Year of diagnosis 1985-94
0 = Diagnosed 75-84
1 = Diagnosed 85-94

Age in 4 categories
0 = 0-44
1 = 45-59
2 = 60-74
3 = 75+