Table 1: General patient characteristics.

- Total NIPPV prior to IMV Only IMV
Variable n Out of % n Out of % n Out of %
All Patients 54 54 100.0% 27 27 100.0% 27 27 100.0%
Race
Asian
Black
Hispanic
Other
Unknown
White
3
13
3
3
2
30		 54
5.6%
24.1%
5.6%
5.6%
3.7%
55.6%
0
7
0
2
2
16		 27
0.0%
25.9%
0.0%
7.4%
7.4%
59.3%
3
6
3
1
0
14		 27
11.1%
22.2%
11.1%
3.7%
0.0%
51.9%
Female 24 54 44.4% 13 27 48.1% 11 27 40.7%
Smoking History
Current
Never
Prior Use
Unknown
1
18
32
3		 54
1.9%
33.3%
59.3%
5.6%
1
9
16
1		 27
3.7%
33.3%
59.3%
3.7%
0
9
16
2		 27
0.0%
33.3%
59.3%
7.4%
Duration of Years with ILD
< 1 Year
1 to < 3 Years
3 to < 5 Years
5+ Years
24
12
7
11		 54
44.4%
22.2%
13.0%
20.4%
11
5
5
6		 27
40.7%
18.5%
18.5%
22.2%
13
7
2
5		 27
48.1%
25.9%
7.4%
18.5%
On Home Oxygen 25 54 46.3% 15 27 55.6% 10 27 37.0%
ILD Subtype
IPF
CTDs
Sarcoidosis
Other
8
17
7
22		 54
14.8%
31.5%
13.0%
40.7%
2
8
4
13		 27
7.4%
29.6%
14.8%
48.1%
6
9
3
9		 27
22.2%
33.3%
11.1%
33.3%
Known Histological Classification
Yes
No
Unknown
15
34
5		 54
27.8%
63.0%
9.3%
7
17
3		 27
25.9%
63.0%
11.1%
8
17
2		 27
29.6%
63.0%
7.4%
Group n Mean [SD] n Mean [SD] n Mean [SD]
Age [Years] 54 65.2 [12.3] 27 65.3 [11.8] 27 65.0 [13.0]
BMI 54 27.2 [6.2] 27 28.1 [5.9] 27 26.4 [6.5]
TLC 21 59.7 [17.2] 12 60.8 [20.9] 9 58.1 [11.7]
FVC 34 52.4 [17.0] 16 51.6 [15.4] 18 53.0 [18.7]
FEV1/FVC 34 91.2 [21.3] 16 89.5 [19.3] 18 92.8 [23.3]
DLCO 24 38.6 [16.7] 13 37.9 [19.6] 11 39.5 [13.3]

Legend: BMI, Body Mass Index; CTDs, Connective Tissue Diseases; DLCO; Diffusing Capacity for Carbon Monoxide % predicted; FEV1/FVC, ratio of Forced Expiratory Volume in the First Second to Forced Vital Capacity; ILD, Interstitial Lung Disease; IPF, Idiopathic Pulmonary Fibrosis; SD, Standard Deviation; TLC; Total Lung Capacity % predicted.