Table 3. Distribution of QRS Duration and Morphology Including Patients With Paced Rhythms
CharacteristicsBlackWhiteP Valuea
Overall (N=970)Male (N=563)Female (N=407)Overall (N=1708)Male (N=1216)Female (N=492)
QRS interval, ms
Median (Q1, Q3)99.0 (89.0, 123.0)101.0 (91.0, 124.0)94.0 (86.0, 122.0)115.0 (98.0, 146.0)116.0 (99.0, 146.0)112.0 (94.5, 146.0)<0.001
QRS category, ms (%)<0.001
<120702 (72.4)401 (71.2)301 (74.0)916 (53.6)652 (53.6)264 (53.7)
120 to 149150 (15.5)88 (15.6)62 (15.2)406 (23.8)284 (23.4)122 (24.8)
≥150118 (12.2)74 (13.1)44 (10.8)386 (22.6)280 (23.0)106 (21.5)
  • a Comparison between races.