1 = Male
2 = Female

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

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

1 = Coecum and ascending
2 = Transverse
3 = Descending and sigmoid
4 = Other and NOS