Patient and hospital characteristics at index aortic valve replacement (AVR) procedure
| Characteristic | 18–64 years | 65+ years | Total | |||
| BV | MV | BV | MV | BV | MV | |
| N (% of N) | N (% of N) | N (% of N) | N (% of N) | N (% of N) | N (% of N) | |
| Number of patients (N) | 1468 | 1996 | 8032 | 1881 | 9500 | 3877 |
| Patient characteristics | ||||||
| Age, median (Q1-Q3) | 59 (53–63) | 55 (47–61) | 77 (73–82) | 74 (69–80) | 76 (69–81) | 65 (55–74) |
| Sex | ||||||
| Female | 404 (27.5) | 606 (30.4) | 2946 (36.7) | 751 (39.9) | 3350 (35.3) | 1357 (35.0) |
| Male | 1064 (72.5) | 1390 (69.6) | 5086 (63.3) | 1130 (60.1) | 6150 (64.7) | 2520 (65.0) |
| Charlson Score* | ||||||
| 0 | 791 (53.9) | 1119 (56.1) | 3389 (42.2) | 750 (39.9) | 4180 (44.0) | 1869 (48.2) |
| 1–2 | 484 (33.0) | 682 (34.2) | 3028 (37.7) | 716 (38.1) | 3512 (37.0) | 1398 (36.1) |
| 3+ | 193 (13.1) | 195 (9.8) | 1615 (20.1) | 415 (22.1) | 1808 (19.0) | 610 (15.7) |
| Remoteness† | ||||||
| Major city | 965 (65.7) | 1344 (67.3) | 5446 (67.8) | 1209 (64.3) | 6411 (67.5) | 2553 (65.8) |
| Inner regional | 331 (22.5) | 341 (17.1) | 1758 (21.9) | 449 (23.9) | 2089 (22.0) | 790 (20.4) |
| Outer regional‡ | 96 (6.5) | 133 (6.7) | 590 (7.4) | 150 (8.0) | 686 (7.2) | 283 (7.3) |
| IRSD (quintile) § | ||||||
| 1 (most disadvantaged) | 323 (22.0) | 431 (21.6) | 1691 (21.1) | 447 (23.8) | 2014 (21.2) | 878 (22.7) |
| 2 | 169 (11.5) | 217 (10.9) | 985 (12.3) | 255 (13.6) | 1154 (12.1) | 472 (12.2) |
| 3 | 152 (10.4) | 221 (11.1) | 951 (11.8) | 212 (11.3) | 1103 (11.6) | 433 (11.2) |
| 4 | 299 (20.4) | 404 (20.2) | 1663 (20.7) | 344 (18.3) | 1962 (20.7) | 748 (19.3) |
| 5 (least disadvantaged) | 445 (30.3) | 538 (27.0) | 2475 (30.8) | 544 (28.9) | 2920 (30.7) | 1082 (27.9) |
| Hospital and episode characteristics | ||||||
| Concomitant procedures | ||||||
| Other valve replacement | 83 (5.7) | 341 (17.1) | 268 (3.3) | 190 (10.1) | 351 (3.7) | 531 (13.7) |
| CABG¶ | 397 (27.0) | 419 (21.0) | 3899 (48.5) | 825 (43.9) | 4296 (45.2) | 1244 (32.1) |
| Admission status | ||||||
| Elective | 1122 (76.4) | 1498 (75.1) | 6036 (75.1) | 1419 (75.4) | 7158 (75.3) | 2917 (75.2) |
| Emergency | 328 (22.3) | 462 (23.1) | 1852 (23.1) | 425 (22.6) | 2180 (22.9) | 887 (22.9) |
| Not assigned | 18 (1.2) | 36 (1.8) | 144 (1.8) | 37 (2.0) | 162 (1.7) | 73 (1.9) |
| Payment status** | ||||||
| Private | 703 (47.9) | 772 (38.7) | 3606 (44.9) | 709 (37.7) | 4309 (45.4) | 1481 (38.2) |
| Public | 664 (45.2) | 1034 (51.8) | 3431 (42.7) | 949 (50.5) | 4095 (43.1) | 1983 (51.1) |
| Other | 100 (6.8) | 187 (9.4) | 993 (12.4) | 219 (11.6) | 1093 (11.5) | 406 (10.5) |
| Hospital AVR volume†† | ||||||
| High (≥90) | 529 (36.0) | 755 (37.8) | 3451 (43.0) | 937 (49.8) | 3980 (41.9) | 1692 (43.6) |
| Low (<90) | 939 (64.0) | 1240 (62.1) | 4581 (57.0) | 944 (50.2) | 5520 (58.1) | 2184 (56.3) |
| Person-years of follow-up | ||||||
| Total | 6765.6 | 11 795.7 | 32 993.0 | 9244.2 | 39 758.6 | 21 039.9 |
| Median (Q1–Q3) | 4.1 (1.7–7.0) | 5.9 (2.9–9.0) | 3.6 (1.4–6.3) | 4.4 (2.0–7.7) | 3.6 (1.5–6.4) | 5.1 (2.3–8.4) |
Note: missing data where % values do not add to 100%.
*Charlson Comorbidity Index calculated with a 1-year lookback, including index AVR admission and any admissions in the year prior
†Accessibility/Remoteness Index of Australia
‡Includes outer regional, remote and very remote
§IRSD: ABS Socio-Economic Index for Areas Index of Relative Social Disadvantage (SEIFA IRSD)
¶CABG: coronary artery bypass graft
**Other payment status on separation includes compensation (workers, NSW motor vehicle accident and other), Department of Veterans Affairs and Medicare ineligible
††Median annual number of AVR procedures performed classified as high (≥90 per year) and low (<90 per year)
ABS, Australian Bureau of Statistics; BV, bioprosthetic valve; MV, mechanical valve.