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Sex- and race-stratified cubic splines for baseline P-wave duration and incident sudden cardiac death adjusted for baseline age, race, sex, study center, educational level, smoking status, body mass index, systolic and diastolic blood pressure, use of antihypertensive medications, diabetes, coronary heart disease, left ventricular hypertrophy, heart failure, use of anti-arrhythmic medications, use of digoxin, and use of beta-blocker medications.
