Table 3

Functional residual capacity (FRC) and total lung capacity (TLC) in the reclined position

PatientsControlsDifference (95% CI)p Value
N21*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.