Table 2.

Results of Bland–Altman analysis for measuring the isovolumic relaxation time

	Addition error		Proportional error
	95% confidence interval	Error or not	slope of the regression curve		Error or not
CW method	8.44–11.98	+	– 0.11	p = 0.25	–
PW method	0.24–3.68	+	0.02	p = 0.88	–
IIs-PW method	– 9.75– 5.56	+	– 0.21	p = 0.03	+
IIs-M mode method	– 0.15–4.37	–	– 0.02	p = 0.86	–
PW time difference method	– 2.39–2.98	–	– 0.18	p = 0.06	–
M-mode time difference method	9.50–15.00	+	– 0.26	p = 0.008	+

CW continuous wave Doppler, PW pulsed Doppler, IIs second sound in heart sound