1) inhaled corticosteroids (ICSs) at a stable daily dose of less than or equal to 220 mcg/day fluticasone propionate via metered dose inhaler (MDI) or equivalent for a minimum of 4 weeks (28 days) before screening visit, or 2) a stable daily dosage of non-corticosteroid therapy, including leukotriene modifiers, theophylline, chromones, or short-acting beta-2 agonists (SABAs) alone or in combination for a minimum of 4 weeks (28 days) before screening visit (SV).