Dim ond pobl gydag asthma difrifol sy’n cael eu cynnwys yng ngrŵp 6 ac mae’r bobl hyn wedi’u diffinio fel pobl sy’n defnyddio corticosteroidau drwy’r geg (o leiaf dri phresgripsiwn yn y ddwy flynedd ddiwethaf) neu sydd wedi gorfod mynd i’r ysbyty oherwydd gwaethygiad yr asthma. Does dim cyfyngiad o ran amser ar dderbyn i’r ysbyty.
Only those with severe asthma are to be included in cohort 6 and they are defined as those with regular use of oral corticosteroids (at least three prescriptions in the past two years) or previously requiring hospital admission for an exacerbation of asthma. There is no time limit on when hospital admission occurred.