Table 2.

Correlation and root mean squared error (RMSE) statistics of the digitised results from 515 standard 3 by 4 ECG images and the ground truth digital ECGs (validation 1).

Lead name	Correlation				Root mean squared error
	Average	SD	p-value	95% confidence interval	Average	SD	p-value	95% confidence interval
I	0.988	0.014	$<0.001$	0.986–0.989	0.043	0.026	$<0.001$	0.041–0.045
II	0.988	0.025	$<0.001$	0.986–0.990	0.043	0.033	$<0.001$	0.040–0.046
V1	0.991	0.018	$<0.001$	0.989–0.992	0.033	0.027	$<0.001$	0.031–0.036
V2	0.991	0.016	$<0.001$	0.989–0.992	0.040	0.031	$<0.001$	0.037–0.043
V3	0.992	0.007	$<0.001$	0.991–0.992	0.044	0.030	$<0.001$	0.041–0.046
V4	0.991	0.008	$<0.001$	0.990–0.992	0.052	0.041	$<0.001$	0.048–0.055
V5	0.991	0.007	$<0.001$	0.990–0.991	0.050	0.038	$<0.001$	0.047–0.053
V6	0.991	0.009	$<0.001$	0.991–0.992	0.049	0.045	$<0.001$	0.045–0.053