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. Author manuscript; available in PMC: 2012 Oct 1.
Published in final edited form as: Heart Rhythm. 2011 Jun 12;8(10):1562–1567. doi: 10.1016/j.hrthm.2011.06.011

Table 2.

Findings on resting 12-lead electrocardiogram, age ≥ 35 yrs, Oregon SUDS 2002–2007 (n=1092)

Case
(n = 642)		 Control
(n = 450)		 P value*
QRS (mean in ms SD) 101.7 25.0
(n = 642)		 97.1 19.7
(n = 450)		 0.0008
Prolonged QRSd (≥ 120 ms) 123 (19.2%) 64 (14.2%) 0.03
QRS Morphology
 Normal
 IVCD
 LBBB
 RBBB
 LAFB
 LPFB
 Bifascicular block
 IRBBB/ILBBB
 1st degree block
435 (67.8%)
64 (10.0%)
21 (3.3%)
23 (3.6%)
22 (3.4%)
3 (0.5%)
15 (2.3%)
14 (2.2%)
45(7.0%)
308(68.4%)
54 (12.0%)
8 (1.8%)
16 (3.6%)
15 (3.3%)
0 (0.0%)
7 (1.6%)
8 (1.8%)
34 (7.6%)		 0.59
JTc (mean in ms SD) 348.2 44.1
(n = 495)		 339.2 34.4
(n = 407)		 0.0006
Prolonged JTc
 Not evaluated† 		167 (33.7%)
147		 101 (24.8%)
43		 0.004
QTc (mean in ms SD) 449.9 43.4
(n = 405)		 428.9 32.8
(n = 354)		 <0.0001
QT (mean in ms SD) 404.0 54.2
(n = 579)		 406.5 42.8
(n = 435)		 0.41
RR (mean in ms SD) 799.1 192.7
(n = 578)		 892.2 194.5
(n = 435)		 <0.0001
Rate (mean bpm SD) 78.8 18.7
(n = 637)		 70.7 17.2
(n = 450)		 <0.0001
Rhythm
 Sinus rhythm
 Sinus arrhythmia
 Atrial fibrillation
 Atrial flutter
552 (86.0%)
11 (1.7%)
70 (10.9%)
9 (1.4%)
422 (93.8%)
7 (1.5%)
18 (4.0%)
3 (0.7%)		 0.0003
*

P value from Pearson chi-square test for categorical variables and t-test for continuous variables.

†

For variables with missing values, proportions and p-values are calculated using the non-missing data as the denominator.

IVCD, intraventricular conduction delay; LBBB, left bundle branch block; RBBB, right bundle branch block; LAFB, left anterior fascicular block; LPFB, left posterior fascicular block; IRBBB/ILBBB, incomplete right/left bundle branch block.