Table 1.

Categorization of asthma severity based upon background therapy and lung function

	Pre-BD FEV1 ≥ 80 % predicted normal	Pre-BD FEV1 ≥ 60- < 80 % predicted normal	Pre-BD FEV1 ≥ 50- < 60 % predicted normal	Pre-BD FEV1 < 50 % predicted normal
Controller medication
None	Eligible for mild asthma cohort	Ineligible	Ineligible	Ineligible
Low to medium ICS alone or in combination with other controllers except chronic oral corticosteroids and omalizumab	Ineligible	Eligible for moderate asthma cohort	Ineligible	Ineligible
High dose ICS alone or in combination with other controllers including chronic oral corticosteroids and omalizumab	Ineligible	Eligible for severe asthma cohort	Eligible for severe asthma cohort	Ineligible