Table 3.
Correlations between Clinical and Certain pH Probe Variables in Subjects with fILD
| FVC% | DLCO% | BMI | AHI | Prox Acid Upright Episodes Per Hr | Prox Acid Recumb Episodes Per Hr | % Upright Time Prox pH<4 | % Recumb Time Prox pH<4 | Prox Non-acid Episodes Per Hr Total | Distal Acid Upright Episodes Per Hr | Distal Acid Recumb Episodes Per Hr | % Upright Time Distal pH<4 | % Recumb Time Distal pH<4 | Distal Non-acid Episodes Per Hr Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| FVC% | 1.0 | 0.53 <0.0001 |
0.19 0.17 |
−0.04 0.79 |
−0.16 0.26 |
−0.16 0.28 |
0.04 0.78 |
−0.10 0.50 |
0.19 0.18 |
0.02 0.88 |
−0.25 0.09 |
0.10 0.51 |
0.01 0.93 |
0.21 0.17 |
| DLCO% | - | 1.0 | −0.07 0.62 |
0.07 0.62 |
−0.31 0.03 |
−0.20 0.17 |
−0.04 0.79 |
−0.07 0.64 |
0.23 0.10 |
−0.31 0.04 |
−0.32 0.03 |
−0.17 0.27 |
−0.11 0.46 |
0.28 0.07 |
| BMI | - | - | 1.0 | 0.03 0.85 |
−0.12 0.40 |
−0.06 0.69 |
−0.05 0.71 |
0.05 0.75 |
0.01 0.94 |
0.11 0.47 |
0.02 0.91 |
0.23 0.12 |
0.20 0.19 |
0.04 0.79 |
| AHI | - | - | - | 1.0 | −0.004 0.98 |
−0.06 0.67 |
−0.07 0.61 |
−0.18 0.20 |
−0.22 0.12 |
−0.07 0.64 |
−0.09 0.57 |
−0.18 0.24 |
−0.30 0.05 |
−0.24 0.10 |
Data are correlation coefficients (above) and p value (below); Prox=proximal channel of pH probe; Distal=distal channel of pH probe; Recumb=recumbent body position; FVC%=percent predicted forced vital capacity; DLCO%=percent predicted diffusing capacity of the lung for carbon monoxide; BMI=body mass index; AHI=apnea hypopnea index