|Here is the cut off Z-scores in 2011
 Colombo district (Sinhalese - 76%) - 1.9770
 Matara district (more than 90% are Sinhalese) - 1.9689
 Galle district (more than 90%) - 1.9470
 Hambantota district (more than 90%)  - 1.9327
.
.
 Mullaitivu ( majority are tamils ) - 0.5950