Table 1.
Patient characteristics per experience quartile
| Characteristic (number of implants) | Quartiles |
||||
|---|---|---|---|---|---|
| Q1 (1–4) | Q2 (5–12) | Q3 (13–28) | Q4 (>28) | P value | |
| Number of patients | 248 | 203 | 222 | 216 | |
| Implantersa | 95 | 48 | 25 | 11 | |
| Age (years) | 51.0 ± 17.0 | 47.3 ± 17.9 | 48.6 ± 16.4 | 53.9 ± 15.8 | <0.001 |
| Female (%) | 62 (25.1) | 54 (26.7) | 65 (30.2) | 60 (28.2) | 0.653 |
| Primary prevention (%) | 180 (72.9) | 135 (67.5) | 145 (67.4) | 150 (71.1) | 0.503 |
| QRS (ms) | 107 ± 27 | 103 ± 21 | 104 ± 22 | 108 ± 25 | 0.224 |
| LVEF (%) | 38 ± 17 | 40 ± 18 | 42 ± 18 | 37 ± 17 | 0.59 |
| BMI | 28.5 ± 6.7 | 28.5 ± 7.2 | 28.0 ± 6.9 | 27.9 ± 5.6 | 0.764 |
| Congestive heart failure (%) | 128 (52.0) | 80 (40.2) | 73 (34.0) | 88 (41.3) | 0.001 |
| AF (%) | 40 (16.3) | 23 (11.6) | 40 (18.6) | 40 (18.8) | 0.154 |
| NYHA Classes III and IV (%) | 33 (26.8) | 21 (28.8) | 26 (44.1) | 28 (38.9) | 0.070 |
| Diabetes (%) | 62 (25.2) | 25 (12.6) | 33 (15.3) | 36 (16.9) | 0.004 |
| COPD (%) | 18 (7.3) | 4 (2.0) | 21 (9.8) | 13 (6.1) | 0.007 |
| Hypertension (%) | 129 (52.4) | 70 (35.4) | 71 (33.0) | 61 (28.6) | <0.001 |
| Dual-zone programming (%) | 152 (64.1) | 154 (79.0) | 176 (83.4) | 207 (95.8) | <0.001 |
| Conditional zone rate | 195 ± 20 | 201 ± 20 | 201 ± 21 | 195 ± 14 | 0.79 |
LVEF, left ventricular ejection fraction; BMI, body mass index; CHF, congestive heart failure; HCM, hypertrophic cardiomyopathy; AF, atrial fibrillation; NYHA, New York Heart Association classification; COPD, chronic obstructive pulmonary disease.
aImplanters can contribute to more than one quartile.