Table 2.

Training and validation error in GESUS²⁵ and replication error in Inter99².

Type	Variables	Validation on GESUS (fivefold)		Replication on Inter99		Zero R on Inter99
		MAE	RMSE	MAE	RMSE	MAE	RMSE
Median	QT Interval (ms)	3.26 ± 0.80	5.08 ± 0.40	3.13 ± 0.19	4.89 ± 0.19	21.7	27.4
	PR Interval (ms)	2.82 ± 0.15	4.52 ± 0.49	2.73 ± 0.06	4.70 ± 0.23	17.6	22.8
	QRS duration (ms)	2.98 ± 0.15	4.10 ± 0.22	2.58 ± 0.07	3.43 ± 0.07	9.0	11.6
	Heart Rate (beats per min)	1.54 ± 0.07	2.44 ± 0.09	1.57 ± 0.06	2.33 ± 0.07	8.6	11.1
	J-point elevation (µV)	8.16 ± 0.40	11.20 ± 0.69	5.77 ± 0.10	8.09 ± 0.12	22.2	29.0
	T-wave amplitude (µV)	5.63 ± 1.31	15.2 ± 6.83	5.80 ± 1.13	16.10 ± 0.53	129.0	167.0
	R-peak amplitude (µV)	8.60 ± 1.05	16.00 ± 4.13	8.30 ± 0.98	21.70 ± 0.71	413.0	501.0
Rhythm	QT Interval (ms)	3.97 ± 0.03	6.05 ± 0.39	3.62 ± 0.03	5.82 ± 0.20	21.7	27.4
	PR Interval (ms)	3.67 ± 0.21	5.60 ± 0.60	3.58 ± 0.60	5.80 ± 0.31	17.6	22.8
	QRS duration (ms)	3.08 ± 0.12	4.33 ± 0.17	3.39 ± 0.06	4.49 ± 0.07	9.0	11.6
	Heart Rate (beats per min)	0.31 ± 0.01	0.40 ± 0.02	0.18 ± 0.01	0.6 ± 0.1	8.6	11.1
	J-point elevation (µV)	10.50 ± 0.31	14.10 ± 0.50	7.90 ± 0.19	10.70 ± 0.24	22.2	29.0
	T-wave amplitude (µV)	11.50 ± 0.43	25.00 ± 5.55	9.40 ± 0.41	19.40 ± 1.79	129.0	167.0
	R-peak amplitude (µV)	20.10 ± 0.70	33.00 ± 4.54	17.4 ± 0.55	51.00 ± 13.21	413.0	501.0