Subgroup analyses for the association of prespecified study characteristics and overall outcomes.

1p values for subgroup effects.2p values for subgroup interaction.POAF, post-operative atrial fibrillation; LOH, length of hospitalization; RR, relative risk; WMD, weighed mean difference; HTN, hypertension; DM, diabetes mellitus; COPD, chronic obstructive pulmonary disease; AF, atrial fibrillation; LVEF, left ventricular ejection fraction; LAD, left atrial dimension; ACEI, angiotensin converting enzyme inhibitors; ARB, angiotensin II receptor blockers; DHA, ducosahexaenoic acid; EPA, eicosapentaenoic acid.