Table 1.

Improvement in FEV₁ following cumulative bronchodilator challenge with salbutamol. Data are expressed as mean ±s.d.

	FEV1 (1)
	Untreated spacer	Treated spacer
Baseline	2.61 ± 0.57	2.52 ± 0.46
100 µg	2.76 ± 0.54	2.83 ± 0.49
200 µg	2.84 ± 0.57	2.97 ± 0.51
400 µg	2.90 ± 0.57	2.99 ± 0.52
800 µg	2.95 ± 0.57	3.02 ± 0.53
1600 µg	2.96 ± 0.40	3.03 ± 0.34