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. 2014 Jul 18;117(6):577–585. doi: 10.1152/japplphysiol.00326.2014

Table 1.

Subject demographics and spectroscopic ratios

Ratiosb
Subjecta Age, yr RBC:barrier TLCc, liters DLCOc, ml·min−1·mmHg−1 RBC:gas Barrier:gas Lung Inflation, %
Healthy
    1 59 0.47 0.002 0.005 7.6 23.3 59.1
    2 65 0.47 0.003 0.006 7.2 28.1 62.6
    3 51 0.35 0.002 0.007 5.7 21.5 74.9
    4 24 0.79 0.003 0.004 6.7 26.6 66.3
    5 33 0.57 0.003 0.005 8.0 31.8 68.6
    6 29 0.43 0.003 0.007 6.3 27.8 61.7
    7 27 0.65 0.005 0.008 7.2 42.7 54.6
    8 23 0.53 0.007 0.014 7.3 31.9 46.7
    9 22 0.69 0.006 0.009 9.2 29.8 54.9
    10 56 0.52 0.004 0.007 6.6 25.7 70.3
    11 65 0.53 0.004 0.008 7.0 30.1 59.7
IPF
    1 74 0.13 0.002 0.012 4.2 10.8
    2 83 0.22 0.003 0.013 4.7 12.6
    3 54 0.17 0.003 0.016 3.8 11.2
    4 51 0.14 0.002 0.011 3.3 7.2
    5 72 0.16 0.001 0.008 4.1 9.4
    6 67 0.16 0.001 0.009 3.8 9.4
a

All subjects were male, except subject 3. bRatios were measured in the supine position. cPulmonary function data were measured in the upright position. IPF, idiopathic pulmonary fibrosis; RBC, red blood cell; TLC, total lung capacity; DLCO, lung diffusing capacity for carbon monoxide.