Descriptive analysis of primary and secondary end-points between MasterScreen and HypAir
| Variables | MasterScreen | HypAir | Per cent difference |
| Primary end-point | |||
| DLNO mL·min−1·mmHg−1 | 121.30 (110.13 to 132.48) | 145.73 (132.04 to 159.41) | −16.5 (−17.8 to −15.1) |
| Secondary end-points | |||
| DLCO mL·min−1·mmHg−1 | 28.47 (25.81 to 31.13) | 28.15 (25.46 to 30.84) | 1.4 (−0.1 to 2.9) |
| Alveolar volume L | 5.80 (5.38 to 6.21) | 6.28 (5.85 to 6.71) | −8.0 (−8.9 to – 7.0) |
| Breath-hold time s | 6.28 (6.17 to 6.39) | 5.93 (5.81 to 6.05) | 6.2 (4.6 to 7.8) |
| Inspiratory volume L | 4.66 (4.28 to 5.04) | 4.68 (4.31 to 5.05) | −0.5 (−1.7 to 0.7) |
| κNO s−1 | −6.13 (−6.25 to −6.00) | −7.23 (−7.44 to −7.02) | −14.6 (−17.3 to −11.9) |
| κCO s−1 | −0.018 (−0.019 to −0.018) | −0.022 (−0.022 to −0.021) | −15.8 (−17.2 to −14.4) |
| KNO mL·min−1·mmHg−1·L−1 | 20.8 (19.7 to 21.9) | 23.1 (21.8 to 24.4) | −9.3 (−10.4 to −8.1) |
| KCO mL·min−1·mmHg−1·L−1 | 4.9 (4.6 to 5.1) | 4.5 (4.2 to 4.7) | 10.2 (8.6 to 11.9) |
| ΔFANO ppm | −38.3 (−38.9 to −37.7) | −42.8 (−44.1 to −41.5) | −9.4 (−12.8 to −6.0) |
| ΔFACO % | −0.11 (−0.12 to −0.11) | −0.13 (−0.13 to −0.13) | −10.9 (−12.4 to −9.4) |
| NO, expired/inspired ratio | 0.117 (0.107 to 0.127) | 0.100 (0.090 to 0.110) | 19.2 (13.9 to 24.6) |
| O2, expired/inspired ratio | 0.877 (0.870 to 0.884) | 0.887 (0.873 to 0.900) | −1.4 (−2.7 to −0.01) |
| CO, expired/inspired ratio | 0.470 (0.458 to 0.481) | 0.475 (0.464 to 0.468) | 1.3 (−0.2 to 2.8) |
| He, expired/inspired ratio | 0.737 (0.718 to 0.756) | 0.683 (0.665 to 0.702) | −10.1 (−10.9 to −9.3) |
Data are presented as mean (95% CI). DLCO: diffusing capacity of the lung for CO; DLNO: diffusing capacity of the lung for NO; κCO: permeability factor for CO; κNO: permeability factor for NO; KNO: transfer coefficient of the lung for NO; KCO: transfer coefficient of the lung for CO; FACO: fractional concentration of CO in the alveolar space; FANO: fractional concentration of NO in the alveolar space; ΔFACO (expired–inspired CO concentration); ΔFANO (expired–inspired NO concentration). Ratios of expired to inspired gas concentrations are also shown.