Fig. 4
From: Coupling of dyspnea perception and occurrence of tachypnea during exercise
Agreement between the thresholds assessed by the intraclass correlation coefficients (ICC) and the Bland–Altman plot. We analyzed the agreement between T VAS and any of the other thresholds using ICC and the Bland–Altman plot. T VAS and all other thresholds were significantly correlated (left panels; a–d). The calculated ICC values between T VAS and any of the other thresholds were also significant. A good agreement of ICC values was given between T VAS and T VE (0.65) (b) and between T VAS and T fR (0.71) (c). The Bland–Altman plots (right panels; a–d) show that the widths of the 95 % limits of agreement (gray color area) are 18.5 ml/min/kg of VO2 for T VCO2 and T VAS (a), 17.0 ml/min/kg for T VE and T VAS (b), 15.5 ml/min/kg for T fR and T VAS (c), and 20.4 ml/min/kg for T VT and T VAS (d). The Bland–Altman plot suggests better agreement between T VAS and T fR than other combinations