Post hoc descriptive analysis of data stratified by FAO category ( screening post-albuterol FEV1/FVC < lower limit of normal [ LLN ] [ FAO + ] or LLN [ FAO - ] ) from two 12-week , randomized , placebo-controlled studies of budesonide/formoterol or the monocomponents in mild-moderate ( study I ; aged 6 years ; NCT00651651 ; placebo run-in ) or moderate-severe ( study II ; 12 years ; NCT00652002 ; budesonide run-in ) asthma patients .