Table 2.

Characteristics of the regression lines from AP–VS intervals calculated or estimated by six observers (I–VI)

	Calculated		I		II		III		IV		V		VI
AP–VS10/20	10	20	10	20	10	20	10	20	10	20	10	20	10	20
Gradient	− 0.28	− 0.56	− 2.06	− 2.06	− 0.49	− 0.58	− 0.48	− 0.48	− 0.50	− 0.50	− 0.29	− 0.33	− 0.48	− 0.46
Intercept	143	209	506	516	196	206	174	168	195	200	140	140	191	179
R2	0.87	0.94	0.97	0.97	0.97	0.93	0.97	0.97	1.0	1.0	0.94	0.97	0.99	0.99

Gradient in ms/bpm, intercept in ms