Table III.
Response rate, floor effect, ceiling effect and missing items of the Oxford hip score (OHS) compared with the Hip dysfunction and Osteoarthritis Outcome Score (HOOS), Short-Form 12 (SF-12) and EuroQol 5D-3L (EQ-5D)
| HOOS (n = 187) | SF-12 (n = 907) | EQ-5D (n = 898) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| OHS (n = 1992) | Pain | Physical function | Quality of life | Physical component | Mental component | Index | VAS | |||
| Response rate* | 87.4 (86.1 to 88.8) | 87.0 (82.4 to 91.58) | 87.9 (85.9 to 89.9) | 87.1 (85.1 to 89.1) | ||||||
| p-value | Reference | 0.843 | 0.782 | 0.721 | ||||||
| Floor effect† | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 (-0.1 to 0.3) | 0.1 (-0.1 to 0.3) | 0.0 | 0.1 (-0.1 to 0.3) | ||
| p-value | Reference | - | - | - | 0.138 | 0.138 | - | 0.136 | ||
| Ceiling effect‡ | 19.9 (18.1 to 21.6) | 46.0 (38.8 to 53.2) | 39.6 (32.5 to 46.6) | 30.0 (23.3 to 36.6) | 8.3 (6.5 to 10.1) | 8.3 (6.5 to 10.1) | 49.9 (46.6 to 53.2) | 12.0 (9.9 to 14.2) | ||
| p-value | Reference | < 0.001 | < 0.001 | 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | ||
| Missing items§ | 1.2 (0.7 to 1.6) | 2.1 (0.5 to 4.2) | 2.1 (0.5 to 4.2) | 0.5 (-0.5 to 1.6) | 0.8 (0.2 to 1.3) | 0.8 (0.2 to 1.3) | 1.0 (0.3 to 1.7) | 4.2 (2.9 to 5.6) | ||
| p-value | Reference | 0.245 | 0.245 | 0.437 | 0.345 | 0.345 | 0.717 | < 0.001 | ||
* defined as percentage who accepted participation and answered the patient-reported outcome measures out of total number. No subscale calculations † floor effect defined as percentage of worst possible outcome out of total number ‡ ceiling effect defined as percentage of best possible outcome out of total number § too many items missing to calculate a sum score (if more than 2 items were omitted, the response was considered invalid and no overall score was calculated, in accordance with the User Manual)