Measure | Within test CV^{#} | 1 month between test ICC^{#} |

RVRTC FEV_{t}^{¶} | 3.4–4.1% | 0.93 |

RVRTC FEF^{¶} | 7.8–8.9% | 0.85 |

FRC_{pleth}^{¶} | 2.3% | 0.93 |

^{#}: Values are expressed as coefficients of variation (CV), the extent of variability in relation to the mean of the population; and intraclass correlation coefficient (ICC), the level of agreement between tests;^{¶}: FEV_{t}: forced expired volume in t seconds, where t = 0.5, 0.75 or 1 second. FEF: forced expiratory flow; FRC_{pleth}: plethysmographic functional residual capacity. Data are summarised from [15].