RESULTS	P-wave duration and RMS20 in the Pre-AF group was not significantly different from the No-AF group ( 143 + / - 21 vs 139 + / - 30 ms , P = 0.26 , and 2.0 + / - 1.3 vs 2.1 + / - 1.0 muV , P = 0.90 ) .\