Table 1.
Baseline characteristics stratified according to QRS duration categories
| Characteristics | QRS Duration (ms) | P-value* | ||
|---|---|---|---|---|
|
| ||||
| <100 (n=11,898) | 100–119 (n=2,990) | ≥120 (n=426) | ||
| Age, mean ± SD (years) | 54 ± 5.8 | 54 ± 5.7 | 57 ± 5.5 | <0.001 |
| Male (%) | 4,352 (37) | 2,221 (74) | 289 (68) | <0.001 |
| Black (%) | 3,240 (27) | 700 (23) | 111 (26) | <0.001 |
| Current smoker (%) | 6,717 (56) | 1,946 (65) | 278 (65) | <0.001 |
| Body mass index, mean ± SD (kg/m2) | 28 ± 5.4 | 28 ± 5.1 | 28 ± 5.1 | <0.001 |
| Systolic blood pressure, mean ± SD (mm Hg) | 121 ± 19 | 123 ± 19 | 124 ± 20 | <0.001 |
| Heart rate, mean ± SD, (bpm) | 67 ± 10 | 64 ± 10 | 65 ± 11 | <0.001 |
| Antihypertensive medications (%) | 3,419 (29) | 1,058 (35) | 185 (43) | <0.001 |
| Diabetes mellitus (%) | 1,363 (11) | 378 (13) | 64 (15) | 0.02 |
| Coronary heart disease (%) | 393 (3.3) | 269 (9.0) | 72 (17) | <0.001 |
| Heart failure (%) | 494 (4.2) | 174 (5.8) | 39 (9.2) | <0.001 |
*
Statistical significance for categorical data was tested using the chi-square procedure and continuous data was tested using the analysis of variance procedure.
SD=standard deviation.