Correlation between Reduced FEF25-75% and a Positive Methacholine Challenge Test in Adults with Nonobstructive Baseline Spirometry

Table 1

Baseline characteristics and results.

	Total	Positive	Negative	value
	496	187 (38%)	309 (62%)
Male	186	58 (31%)	128 (69%)
Female	310	129 (42%)	181 (58%)
Age				<0.001
BMI				0.169
FEF25-75% (L/s)				0.003
FEF25-75% (percentage of predicted)				<0.001
FEV1/FVC				0.019
Prebronchodilator FEV1				0.367
FEV1% predicted				0.064

Results shown as (%) and .