Table 2.

GMs (95% CIs) of values relative to baseline of FEV1 and PEF evaluated in the 18 participants who completed the study.

Variable	0 ppb NO2 (clean air)	200 ppb NO2	600 ppb NO2	p-Value
FEV1/baseline	1.02 (1.00, 1.05)	1.00 (0.97, 1.03)	1.00 (0.98, 1.03)	0.41
PEF/baseline	1.05 (0.99, 1.11)	1.04 (0.98, 1.10)	1.01 (0.96, 1.07)	0.36
Baseline values were measured immediately before first exposure (H0 on day 1) for each series of exposure. Each value corresponds to the GM change from baseline of the six values [H0’, immediately after first exposure (day 1); H6, 6 hr after H0’ (day 1); H32, 32 hr after H0’ (day 2); H48, 48 hr after H0’ (day 3)] obtained by spirometry with flow-volume curves. The effects of exposure, regardless of the dose, on FEV1 and PEF were not significant.