Intraclass correlation coefficient (95% CI) of the slope and projected apnoea threshold between measurement 1 and measurement 2 for rebreathing (slope-R and pAT-R, respectively) and steady-state (slope-SS and pAT-SS, respectively), calculated in the two randomised groups
| R | SS | |
| Slope-R | 0.90 (0.66–0.98) | 0.87 (0.56–0.97) |
| Slope-SS | 0.49 (−0.17–0.84) | 0.58 (−0.14–0.90) |
| pAT-R | 0.90 (0.64–0.97) | 0.85 (0.50–0.96) |
| pAT-SS | −0.08 (−0.65–0.55) | 0.55 (−0.80–0.89) |
The outcomes of slope-R and pAT-R were significant (p<0.05); the outcomes of slope-SS and pAT-SS were not significant (p>0.05).