Table 1.
Demographic and preoperative data concerning the 1,385 hips operated with periacetabular osteotomy. Values are n (%) unless otherwise specified
| Covariates | Value |
|---|---|
| Age at time of surgery | |
| median (IQR) | 32 (23–40) |
| range | (13–59 |
| Sex | |
| female | 1,175 (85) |
| male | 210 (15) |
| Side of operation | |
| right | 770 (56) |
| left | 615 (44) |
| Additional covariates included after 2010 | |
| Educational level (n = 617) | |
| 1. General certificate of secondary education | 101 (16) |
| 2. Upper secondary school leaving | 98 (16) |
| 3. Vocational upper secondary education | 91 (15) |
| 4. Short-cycle higher education | 80 (13) |
| 5. Medium-cycle higher education | 91 (15) |
| 6. Bachelor education | 92 (15) |
| 7. Long-cycle higher education | 60 (9) |
| 8. PhD program | 4 (1) |
| Body mass index (n = 617) | |
| mean (range) | 23 (16–34) |
| Osteoarthritis score a (n = 592) | |
| Grade 0 | 571 (95) |
| Grade 1 or 2 | 21 (5) |
| VAS pain, median (IQR) (n = 618) | |
| pain at rest | 35 (19–56) |
| pain during activity | 75 (61–86) |
| Impingement test (n = 592) | |
| positive | 562 (95) |
| negative | 30 (5) |
| Previous treatment in the same hip (n = 592) | |
| yes | 27 (5) |
| no | 565 (95) |
| Center–edge angle (°) (n = 592) | |
| median (IQR) | 19 (15–20) |
| range | (–10 to 25 |
| Acetabular index angle (°) (n = 592) | |
| median (IQR) | 15 (12–20) |
| range | (0–40 |
aScore according to Tönnis 1987
If data were not available for all 1,385 hips, n is stated.
IQR = interquartile range
VAS = visual analogue scale