. 2007 Dec 15;3(4):123–127. doi: 10.1186/1710-1492-3-4-123

Table 2.

Percentage of Increase for Parameter FEV₁after the Bronchodilator Test with Salbutamol and Ipratropium Bromide and PC₂₀FEV₁after Methacholine Challenge Testing

	*Salbutamol % of Increase FEV*₁	*Ipratropium % of Increase FEV*₁	PC₂₀*FEV₁mg/mL*
Mean	18.39	19.14	0.645
SD	6.18	6.74	0.540
Minimum	12.40	12.10	0.026
Maximum	35.60	37.20	1.914

FEV₁= forced expiratory volume in 1 second; PC₂₀FEV₁= provocative concentration of methacholine that results in a 20% fall in FEV₁.