TABLE 1

Impact of waiting times on repeat measurements of functional residual capacity (FRC) in children and adults

Children nFRC0 SRFRC0 LΔFRC5 LΔFRC15 L
Healthy19−0.65±0.771.90±0.570.09±0.220.01±0.15
Lung disease18−0.47±1.641.54±0.450.01±0.130.03±0.11
Adults nFRC0 SRFRC0 LΔFRC LΔFRC LΔFRC L
Healthy24−0.66±1.442.90±0.76−0.08±0.22−0.03±0.440.03±0.31
Lung disease
 Restrictive16−2.02±0.621.99±0.42−0.07±0.20−0.11±0.27−0.03±0.19
 Obstructive181.56±2.233.69±1.03−0.36±0.44***0.01±0.29−0.15±0.46
  • Data are presented as mean±sd unless otherwise stated. FRC0: baseline FRC; SR: standardised residual; Δ: difference from FRC0 in; FRC5: FRC measured after waiting 5 min; FRC15: FRC measured after waiting 15 min; FRC: FRC measured after waiting for the initial washout time; FRC: FRC measured after waiting for twice the washout time; FRC: FRC measured after waiting for three times the initial washout time. ***: p<0.001.