contains only high values, contains only low values, and contains only normal values are used to identify cases for which the elements of a group are all high, low or normal respectively.
For example, if the group food contains egg, milk and soy, then the case
egg 22 [5 - 15] 18 [5 - 15] 24 [5 - 15] milk 24 [
satisfies the conditions
food contains only high samples