Fig. 2From: Reliever salbutamol use as a measure of exacerbation risk in chronic obstructive pulmonary diseaseLong-term (months 3–12) exacerbation rate by reliever use thresholds. Long-term (months 3–12) exacerbation rates for patients receiving a) FORM and b) BUD/FORM with a mean number of inhalations less than, and greater than or equal to, reliever use in the range from zero to 12 inhalations/day in the week preceding the 2-month visit. BUD budesonide, FORM formoterolBack to article page