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Number of cancer cases and number of person-years according to sub-cohorts (bearing surface between head and cup, cementation, material of the stem)
| Group/Subgroup | No. cancers | Person-years |
|---|---|---|
| Bearing | ||
| MoM | 76 | 4,378.52 |
| MoP | 1,003 | 51,673.26 |
| CoC | 188 | 13,340.13 |
| CoP | 138 | 7,683.65 |
| Use of bone cement | ||
| Non-cemented | 1,156 | 65,624.09 |
| Cemented | 249 | 11,451.47 |
| Stem material | ||
| Ti-alloy | 122 | 68,694.83 |
| CoCr-alloy | 156 | 6,932.79 |
| Fe-alloy | 29 | 1,447.95 |
