Table 3—

Forced expiratory volume in one second (FEV₁) and exhaled nitric oxide (eNO) before and after the placebo and allergen challenge tests

	Subjects n	FEV₁ L		eNO ppb		p-value^#
		Before challenge test	After challenge test	Before challenge test	After challenge test
Placebo	42	3.28±0.81	3.03±0.62	13.96±15.65	12.64±10.70	0.344
Allergen challenge test						0.950
−bronchoconstriction	36	3.23±0.77	2.94±0.67	8.44±5.89	8.40±5.04
+bronchoconstriction	14	3.33±0.59	2.67±0.58	17.50±12.05	25.82±18.24	0.018
+late bronchoconstriction	7	3.03±0.50	2.43±0.44	9.33±2.91	20.41±11.67
+low basal NO level						0.012

Data are presented as mean±sd
ppb: parts per billion
^#: significance of eNO change after challenge test in paired t-test