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. Author manuscript; available in PMC: 2012 Apr 8.
Published in final edited form as: J Occup Environ Med. 2008 Mar;50(3):341–349. doi: 10.1097/JOM.0b013e318162f5eb

TABLE 2.

Spirometry Indices Before and After Ozone Exposure (N = 15)

Spirometry Indices Pre-Exposure Postexposure Change P Value
 FVC (L) 3.8 [3.4, 4.4] 3.4 [2.9, 3.9] −0.5 [−0.2, −0.6] <0.001
 FEV1 (L) 3.4 [2.9, 3.8] 2.8 [2.6, 3.1] −0.4 [−0.3, −0.7] <0.001
 FEF25–75 (L/s) 3.3 [2.6, 5.3] 2.7 [2.1, 4.4] −0.5 [−0.2, −1.2] <0.001
 FEF75 (L/s) 1.9 [1.4, 2.9] 1.5 [1.3, 2.8] −0.3 [−0.1, −0.4] 0.006

Values shown are median [interquartile range].

P values are for paired Wilcoxon signed rank test between pre- and postexposure measurements.

FVC indicates forced vital capacity; FEV1, forced expiratory volume in 1 s; FEF25–75, maximal mid-expiratory flow rate; FEF75, forced expiratory flow after 75% of expelled volume.