Functional residual capacity (FRC) and total lung capacity (TLC) in the reclined position
| Patients | Controls | Difference (95% CI) | p Value | ||
| N | 21* | 30 | |||
| FRC (L) | Median (IQR) | 2.50 (2.32 to 3.60) | 2.78 (2.26 to 2.90) | −0.27 (−0.71 to 0.12) | 0.162† |
| FRC (% predicted) | 76.0 (66.5 to 89.5) | 90.0 (79.8 to 105.0) | −14.0 (−22.0 to −5.0) | 0.003† | |
| TLC (L) | Mean (SD) | 4.40 (0.37) | 6.22 (0.28) | −1.83 (−2.75 to −0.92) | 0.002‡ |
| TLC (% predicted) | 75.3 (16.0) | 103.7 (12.4) | −28 (−37.3 to −19.6) | <0.001‡ |
*6 of 27 patients were unable to complete two reclined FRC measurements.
†p Value calculated using Mann-Whitney U test.
‡p Value calculated using Student’s t-test.