1Er y cafodd tri chategori eu defnyddio ar gyfer diffinio'r ardaloedd TB yng Nghymru mae 5 ardal TB mewn gwirionedd: Uchel-Gorllewin, Uchel-Dwyrain, Canolradd - Canolbarth, Canolradd - Gogledd, Isel o ran TB.
1Though three categories were used to define the TB areas in Wales, there are actually 5 discrete TB areas: High-West, High-East, Intermediate-Mid, Intermediate-North, Low TB.