Table 2.
Means and SD of covariates by ERP status among pre-season athletes (cross-sectional cohort)
| All sports pooled, preseason (n=879)
|
||||||||
|---|---|---|---|---|---|---|---|---|
| ERP neg (n = 658) | ERP positive (n = 221) | Inferior ERP pos (n = 33) | ||||||
| Mean or N | SD or % | Mean or N | SD or % | p* | Mean or N | SD or % | p* | |
|
|
|
|
||||||
| Demographics | ||||||||
| Age, years | 18.4 | 0.8 | 18.5 | 0.9 | 0.02 | 18.4 | 0.8 | 0.99 |
| Sex, % male | 358 | 54.4% | 187 | 84.2% | <0.001 | 10 | 30.3% | 0.23 |
| Black, % | 36 | 5.5% | 56 | 25.2% | <0.001 | 17 | 51.5% | <0.001 |
| Anthropometrics | ||||||||
| Height, inches | 70.0 | 2.9 | 71.0 | 3.0 | <0.001 | 71.0 | 2.3 | 0.05 |
| Weight, pounds | 165.3 | 30.6 | 171.2 | 29.9 | 0.12 | 166.9 | 23.9 | 0.75 |
| BMI, kg/m2 | 23.5 | 2.7 | 23.7 | 2.6 | 0.37 | 23.2 | 2.0 | 0.47 |
| Clinical data | ||||||||
| Diastolic BP, mmHg | 116.0 | 8.7 | 115.7 | 8.2 | 0.60 | 115.3 | 8.3 | 0.61 |
| Systolic BP, mmHg | 56.4 | 11.4 | 58.7 | 11.4 | 0.11 | 60.1 | 12.5 | 0.07 |
| ECG data (on post season ECG) | ||||||||
| HR bpm | 61.2 | 9.9 | 57.5 | 8.7 | <0.001 | 54.4 | 8.8 | <0.001 |
| PR interval, msec | 147.7 | 19.8 | 150.8 | 25.9 | 0.07 | 152.6 | 20.0 | 0.17 |
| QRS, msec | 92.4 | 11.5 | 95.1 | 9.1 | 0.001 | 93.6 | 8.5 | 0.54 |
| QTc, msec | 408.4 | 24.7 | 405.8 | 32.6 | 0.22 | 407.8 | 34.5 | 0.91 |
| Sokolow-Lyon index, mV | 2.81 | 0.95 | 3.65 | 0.98 | <0.001 | 3.51 | 1.18 | <0.001 |
| Sokolow-Lyon index, >3.5mV | 142 | 21.6% | 114 | 51.4% | <0.001 | 16 | 48.5% | <0.001 |
| LBBB | 0 | 0.0% | 0 | 0.0% | N/A | 0 | 0.0% | N/A |
| RBBB | 8 | 1.2% | 3 | 1.4% | 0.56 | 0 | 0.0% | 0.66 |
| IRBBB | 60 | 9.1% | 33 | 14.9% | 0.014 | 0 | 0.0% | 0.023 |
| Training characteristics | ||||||||
| Strength training, hrs | 2.8 | 2.7 | 3.1 | 2.8 | 0.082 | 2.9 | 2.7 | 0.67 |
| Endurance training, hrs | 3.8 | 2.3 | 4.2 | 3.0 | 0.033 | 3.8 | 2.4 | 0.99 |
| Total training, hrs | 6.5 | 3.8 | 7.3 | 4.0 | 0.009 | 6.3 | 2.8 | 0.75 |
| Medical history | ||||||||
| HTN | 3 | 0.5% | 0 | 0.0% | 0.42 | 0 | 0.0% | 0.89 |
| FH or HTN | 51 | 7.8% | 15 | 6.8% | 0.37 | 1 | 3.0% | 0.28 |
| Med use | 121 | 18.4% | 28 | 12.6% | 0.026 | 6 | 18.2% | 0.50 |
ERP includes both lateral and inferior subtypes. BMI: body mass index, BP: blood pressure, HTN: hypertension, FH: family history,
*
compared to ERP negative