Table 2. Frequencies of Bearing Surface According to Gender, Age, Hospital Type, Hospital Volume, and Payer Type.
| Variable | Bearing surface | ||||
|---|---|---|---|---|---|
| CoC | CoP | MoP | MoM | Overall | |
| Total | 23,678 (76.7) | 2,263 (7.3) | 3,684 (11.9) | 1,256 (4.1) | 30,881 (100) |
| Sex | |||||
| Male | 13,043 (78.9) | 1,064 (6.4) | 1,730 (10.5) | 685 (4.1) | 16,522 (100) |
| Female | 10,635 (74.1) | 1,199 (8.4) | 1,954 (13.6) | 571 (4.0) | 14,359 (100) |
| Age (yr) | |||||
| Mean | 57.1 | 62.2 | 63.0 | 56.8 | 58.1 |
| < 45 | 4,389 (84.9) | 210 (4.1) | 346 (6.7) | 225 (4.4) | 5,143 (100) |
| 45-64 | 11,330 (79.6) | 910 (6.4) | 1,355 (9.5) | 637 (4.5) | 14,254 (100) |
| 65-74 | 5,738 (69.9) | 807 (9.8) | 1,365 (16.6) | 301 (3.7) | 8,226 (100) |
| 75-84 | 2,010 (67.7) | 311 (10.5) | 562 (18.9) | 88 (3.0) | 2,961 (100) |
| ≥ 85 | 211 (71.0) | 25 (8.4) | 56 (18.9) | 5 (1.7) | 297 (100) |
| Hospital type | |||||
| Clinic | 349 (75.7) | 36 (7.8) | 64 (13.9) | 12 (2.6) | 461 (100) |
| Hospital | 6,859 (77.3) | 817 (9.2) | 1,012 (11.4) | 186 (2.1) | 8,874 (100) |
| General hospital | 8,220 (74.7) | 832 (7.6) | 1,454 (13.2) | 496 (4.5) | 11,002 (100) |
| Tertiary hospital | 8,250 (78.2) | 578 (5.5) | 1,154 (10.9) | 562 (5.3) | 10,544 (100) |
| Hospital volume | |||||
| Low | 7,849 (70.6) | 776 (7.0) | 2,036 (18.3) | 450 (4.1) | 11,111 (100) |
| Medium | 4,680 (74.3) | 466 (7.4) | 937 (14.9) | 219 (3.5) | 6,302 (100) |
| High | 11,149 (82.8) | 1,021 (7.6) | 711 (5.3) | 587 (4.4) | 13,468 (100) |
| Payer type | |||||
| Health insurance | 20,880 (77.2) | 1,977 (7.3) | 3,098 (11.5) | 1,092 (4.0) | 27,047 (100) |
| Medical aid | 2,798 (73.0) | 286 (7.5) | 586 (15.3) | 164 (4.3) | 3,834 (100) |
| Mean hospital charge ($) | 6,358 | 5,870 | 6,066 | 6,163 | - |
Values are presented as number (%) unless otherwise indicated.
CoC: ceramic-on-ceramic, CoP: ceramic-on-polyethylene, MoP: metal-on-polyethylene, MoM: metal-on-metal.