Table 2.: Inspiratory Flows and Volumes in Cystic Fibrosis Subjects Overall and Grouped by FEV1

Group Mean Parameters (SD)
Baseline FEV1 PIF
(L/min)		 IF25
(L/min)		 IF50
(L/min)		 IF75
(L/min)		 IV
(L)		 IV1
(L)
n=25
Overall (SD)
Range		   75.5 (27.2)
27.2 – 142.8		   71.7 (25.7)
25.8 – 130.2 		  68.7 (27.1)
22.2 – 136.2		   57.9 (24.1)
21.0 – 122.4		   1.83 (0.97)
0.54 – 4.03		   1.05 (0.39)
0.39 – 1.96
n=7
FEV1 ≤ 1L (SD)
Range		   51.0 (15.4)
27 – 70.8		   49.3 (15.4)
25.8 – 68.4 		  45.6 (15.7)
22.2 – 66.6		   36.4 (13.7)
20.4 – 54.6 		  0.90 (0.33)
0.54 – 1.39		   0.68 (0.21)
0.39 – 0.92
n=18
FEV1 > 1L (SD)
Range 		  85.1 (24.9)
52.2 – 142.8		   80.4 (23.8)
48.0 – 130.2		   77.6 (25.4)
46.8 – 136.2		   64.7 (22.7)
25.8 – 120.6		   2.20 (0.89)
1.00 – 4.03		   1.19 (0.35)
0.76 – 1.96

PIF - Peak inspiratory flow, IF25 - Inspiratory flow at 25% inspiratory volume, IF50 - Inspiratory flow at 50% inspiratory volume, IF75 - Inspiratory flow at 75% inspiratory volume, IV - Inspiratory volume, IV1 - Inspiratory volume in 1 second.