Table 1

Mean differences in peak expiratory flow (PEF) and forced expiratory volume in one second (FEV1) between treatment with salmeterol v an increased dose of inhaled steroids in symptomatic asthma (in favour of added salmeterol) (all p<0.001 except * p<0.01)

Outcomes3 months6 months
PEF (litre/min)22.4 (15 to 30)27.7 (19 to 36)
FEV1 (litre) 0.10 (0.04 to 0.16) 0.08 (0.02 to 0.14)*