Table 4.

Association between the number of ECG abnormalities and risk for sudden cardiac death.

Number of ECG abnormalities	Number of SCDs/subjects at risk	Univariate	P value	Multivariatea	P value
10-year follow-up
1 ECG abnormality	16/1313	2.10 (1.19–3.69)	0.011	1.29 (0.72–2.30)	0.393
≥2 ECG abnormalities	10/186	7.62 (3.85–15.09)	<0.001	3.22 (1.57–6.62)	0.001
30-year follow-up
1 ECG abnormality	87/1313	1.55 (1.23–1.96)	<0.001	1.12 (0.89–1.43)	0.334
≥2 ECG abnormalities	37/186	4.57 (3.26–6.41)	<0.001	2.97 (2.09–4.20)	<0.001

^aAdjusted for age, gender, systolic blood pressure, diabetes, BMI and cholesterol. ECG = electrocardiogram.