Summary descriptive statistics
| Variable | Mean | SD | Minimum | Maximum | Observed |
| Outcome variables | |||||
| Reimbursement cost | £17 399.09 | £13 966.49 | £1262.98 | £141 196.20 | 445 |
| Length of stay | 16.29 | 15.16 | 1 | 95 | 447 |
| Comorbidities | |||||
| CABG | 0.12 | 0.32 | 0 | 1 | 445 |
| Valve surgery and CABG | 0.01 | 0.11 | 0 | 1 | 445 |
| Cerebrovascular disease | 0.10 | 0.31 | 0 | 1 | 445 |
| Ischaemic heart disease | 0.38 | 0.49 | 0 | 1 | 444 |
| Valve surgery | 0.08 | 0.27 | 0 | 1 | 445 |
| Heart failure | 0.41 | 0.49 | 0 | 1 | 445 |
| Diabetes mellitus | 0.19 | 0.39 | 0 | 1 | 445 |
| High blood pressure | 0.51 | 0.50 | 0 | 1 | 445 |
| Respiratory | 0.13 | 0.34 | 0 | 1 | 444 |
| Peripheral vascular disease | 0.04 | 0.19 | 0 | 1 | 445 |
| Renal failure | 0.23 | 0.42 | 0 | 1 | 445 |
| ≥2 comorbidities | 0.58 | 0.49 | 0 | 1 | 446 |
| ≥3 comorbidities | 0.40 | 0.49 | 0 | 1 | 446 |
| Device type | |||||
| Single chamber pacemaker | 0.06 | 0.24 | 0 | 1 | 445 |
| ICD | 0.29 | 0.46 | 0 | 1 | 445 |
| CRT-P | 0.07 | 0.25 | 0 | 1 | 445 |
| CRT-D | 0.24 | 0.43 | 0 | 1 | 445 |
| Number of ICD coils | |||||
| Single coil | 0.26 | 0.46 | 0 | 1 | 444 |
| Dual coil | 0.24 | 0.46 | 0 | 1 | 444 |
| Indication for pacing | |||||
| Sinus node dysfunction | 0.19 | 0.39 | 0 | 1 | 438 |
| Sinus node dysfunction with AV block | 0.01 | 0.10 | 0 | 1 | 439 |
| Atrial fibrillation/atrial flutter | 0.11 | 0.32 | 0 | 1 | 439 |
| Second or third degree AV block | 0.21 | 0.41 | 0 | 1 | 439 |
| Congenital | 0.03 | 0.16 | 0 | 1 | 439 |
| VT or VF | 0.24 | 0.43 | 0 | 1 | 439 |
| Indication for lead extraction | |||||
| Local infection | 0.36 | 0.48 | 0 | 1 | 445 |
| Systemic infection | 0.13 | 0.33 | 0 | 1 | 445 |
| Non-infective indication | 0.24 | 0.43 | 0 | 1 | 439 |
| Other variables | |||||
| Male | 0.72 | 0.45 | 0 | 1 | 446 |
| Vegetation | 0.10 | 0.30 | 0 | 1 | 320 |
| LVEF | 46.18 | 14.96 | 0 | 71 | 313 |
| Age of patient at extraction | 64.80 | 14.74 | 0.16 | 94.84 | 446 |
| Positive microbiology | 0.45 | 0.50 | 0 | 1 | 437 |
| Number of episodes of care | 1.56 | 0.95 | 1 | 7 | 447 |
Overviews of the outcome and explanatory variables with their respective summary descriptive statistics.
AV, atrioventricular; CABG, coronary artery bypass graft surgery; CRT-D, cardiac resynchronisation therapy defibrillator; CRT-P, cardiac resynchronisation therapy pacemaker; ICD, implantable cardioverter-defibrillator; LVEF, left ventricular ejection fraction; VF, ventricular fibrillation; VT, ventricular tachycardia.