Table 2.

Buttocks electrocardiogram beat classification results comparing the original and modified Pan–Tompkins algorithm.

Study Cohort	Total beats	Modified PTa			Original PT
		SQIb pass (%)	Sec (%)	PPVd (%)	Se (%)	PPV (%)
Normative	30,075	79.6	98.2	98.1	86.1	77.7
HFe	41,820	45.4	94.2	96.6	62.2	59.6
Cumulative	71,895	60.1	96.4	96.7	72.2	67.4

^aPT: Pan–Tompkins.

^bSQI: signal quality index.

^cSe: sensitivity.

^dPPV: positive predictive value.

^eHF: heart failure.