Table 1.
Patient data
| Variables | Born in Sweden n (%) | Nordic Countries a n (%) | Europe b n (%) | Outside Europe c n (%) |
|---|---|---|---|---|
| Sex | ||||
| Male | 7,407 (43) | 254 (31) | 222 (42) | 61 (56) |
| Female | 9,933 (57) | 565 (69) | 301 (58) | 48 (44) |
| Age, mean d | 68.5 | 68.0 | 66.7 | 61.3 |
| (95% CI) | (68.4–68.6) | (67.4–68.6) | (65.8–67.7) | (58.4–64.3) |
| < 60 years | 3,159 (18) | 151 (18) | 124 (24) | 52 (48) |
| ≥ 60 years | 14,181 (82) | 668 (82) | 399 (76) | 57 (52) |
| Diagnoses | ||||
| Primary OA | 15,756 (91) | 743 (91) | 475 (91) | 84 (77) |
| Secondary OA | 1,584 (9) | 76 (9) | 48 (9) | 25 (23) |
| Charnley class | ||||
| A + B | 9,638 8 (56) | 417 (51) | 245 (47) | 44 (40) |
| C | 7,701 (44) | 402 (49) | 278 (53) | 65 (60) |
| Cohabiting | ||||
| Yes | 10,746 (62) | 476 (58) | 304 (58) | 73 (67) |
| No | 6,594 (38) | 343 (42) | 219 (42) | 36 (33) |
| Education (ISCED 97) | ||||
| Low | 10,123 (58) | 505 (62) | 231 (44) | 54 (49) |
| Middle/High | 7,217 (42) | 314 (38) | 292 (56) | 55 (51) |
| Comorbidity score e | ||||
| Elixhauser 0 | 11,731 (68) | 539 (66) | 337 (64) | 72 (66) |
| Elixhauser ≥ 1 | 5,609 (32) | 280 (34) | 186 (36) | 37 (34) |
| Charlson 0 | 14,386 (83) | 656 (80) | 417 (80) | 83 (76) |
| Charlson ≥ 1 | 2,954 (17) | 163 (20) | 106 (20) | 26 (24) |
| Type of fixation | ||||
| Cemented | 14,429 (83) | 681 (83) | 402 (77) | 59 (54) |
| Uncemented, hybrid, | ||||
| reversed hybrid | 2,911 (17) | 138 (17) | 121 (23) | 50 (46) |
| Incision | ||||
| Lateral | 5,929 (34) | 356 (43) | 234 (45) | 60 (55) |
| Posterior | 11,411 (66) | 463 (57) | 289 (55) | 49 (45) |
a Excluding Sweden.
b Excluding previous Soviet Union.
c Including previous Soviet Union.
d Mean, 95% confidence interval of the mean.
e No comorbidity (0) or 1 or more comorbidities according to Elixhauser or Charlson.