Table 5.

Correlation and root mean squared error (RMSE) statistics of the digitised results from selected 45 12 by 1 ECG images and the ground truth digital ECGs (validation 2).

Lead name	Correlation				Root mean squared error
	Average	SD	p-value	95% confidence interval	Average	SD	p-value	95% confidence interval
I	0.963	0.015	$<0.001$	0.959–0.968	0.039	0.012	$<0.001$	0.035–0.043
II	0.979	0.011	$<0.001$	0.975–0.982	0.033	0.016	$<0.001$	0.029–0.038
V1	0.981	0.013	$<0.001$	0.977–0.985	0.029	0.011	$<0.001$	0.026–0.032
V2	0.987	0.015	$<0.001$	0.982–0.991	0.033	0.016	$<0.001$	0.028–0.038
V3	0.973	0.056	$<0.001$	0.960–0.990	0.037	0.024	$<0.001$	0.030–0.044
V4	0.973	0.052	$<0.001$	0.957–0.988	0.040	0.025	$<0.001$	0.032–0.047
V5	0.986	0.013	$<0.001$	0.983–0.990	0.037	0.024	$<0.001$	0.031–0.042
V6	0.991	0.006	$<0.001$	0.990–0.993	0.034	0.015	$<0.001$	0.029–0.038