TABLE 1.
Summary statistics of demographic data and clinical characteristics of all patients.
| Training cohort | Validation cohort | Testing cohort | |||||||
| RVOT | LVOT | P-value | RVOT | LVOT | P-Value | RVOT | LVOT | P-Value | |
| Patients, n (%) | 263 (77) | 77 (23) | 0.921 | 30 (79) | 8 (21) | 0.991 | 33 (79) | 9 (21) | <0.01 |
| Age, year, mean ± sd | 46.5 ± 10.6 | 47.5 ± 11.3 | 0.731 | 45.1 ± 13.8 | 46.9 ± 9.2 | 0.74 | 43.8 ± 15.0 | 45.3 ± 17.1 | 0.652 |
| Male, n (%) | 80 (66) | 41 (34) | <0.01 | 6 (46) | 7 (54) | <0.01 | 7 (58) | 5 (42) | <0.01 |
| BMI (kg/m2), mean ± sd | 28.33 ± 3.24 | 29.28 ± 2.19 | <0.01 | 30.11 ± 3.17 | 28.37 ± 4.53 | <0.01 | 27.62 ± 4.15 | 28.37 ± 4.72 | <0.01 |
| PVC, n/24 h mean ± sd | , 28,455.5 ± 9,635.8 | 29,358.5 ± 12,117.4 | 0.651 | 30,356.5 ± 18,587.8 | 276,565 ± 10,997.8 | 0.531 | 23,218.5 ± 11,755.6 | 33,035.6 ± 18,256.3 | 0.0273 |
| Frequent PVC, n (%) | 249 (78) | 70 (22) | 0.683 | 22 (76) | 7 (24) | 0.818 | 28 (85) | 4 (44.5) | 0.046 |
| Paroxysm VT, n (%) | 14 (78) | 4 (22) | 1 | 1 | 0 | 1 | 2 (6) | 4 (44.5) | 0.023 |
| Sustained VT, n (%) | 6 (67) | 3 (34) | 0.425 | 1 | 1 | 0.398 | 3 (9) | 1 (11) | 1 |
| VT cycle length (ms), mean ± sd | 410 ± 57 | 424 ± 102 | 0.431 | 426 ± 74 | 430 ± 88 | 0.621 | 438 ± 93 | 402 ± 147 | 0.886 |
| Pre-QRS activation time (ms), mean ± sd | 29.38 ± 10.26 | 31.27 ± 8.25 | 0.334 | 33.40 ± 5.51 | 31.65 ± 8.76 | 0.63 | 28.64 ± 9.69 | 33.48 ± 8.46 | 0.5 |
| Prior CA, n | 2 | 1 | 0.533 | 0 | 0 | 1 | 2 | 0 | 1 |
| Myocardiopathy,n | 1 | 2 | 0.127 | 1 | 0 | 1 | 1 | 1 | 0.398 |
| Alcoholic cardiomyopathy, n | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1 |
| ICD (VT), n | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 1 |
| Coronary heart disease, n | 3 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 0.398 |
P-values present the probabilities of equal means or proportions of each tested variable. LVOT, left ventricular outflow tract; RVOT, right ventricular outflow tract; BMI, body mass index; LVEF, left ventricular ejection fraction; PVC, premature ventricular complex; VT, ventricular tachycardia; CA, catheter ablation.