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Journal of Patient-Reported Outcomes

Table 4 Clinically important improvement in patient-reported outcomes and early revision

From: Hip-specific and generic patient-reported outcome measure scores after primary hip replacement are associated with early revision surgery: a national registry study

Post-operative variable

Relative risk adjusted for

age and gender*

(95%CI)

Hip pain VAS

 

 Achieved MIC (n = 14,884)

1.00 (reference)

 Did not achieve MIC (n = 1,608)

3.95 (2.30 to 6.77)

Oxford Hip Score

 

 Achieved MIC (n = 15,300)

1.00 (reference)

 Did not achieve MIC (n = 3,570)

5.00 (3.21 to 7.77)

HOOS-12 Pain

 

 Achieved MIC (n = 8,045)

1.00 (reference)

 Did not achieve MIC (n = 1,221)

5.64 (2.79 to 11.38)

HOOS-12 Function

 

 Achieved MIC (n = 8,193)

1.00 (reference)

 Did not achieve MIC (n = 1,041)

1.79 (0.73 to 4.39)

HOOS-12 Quality of life

 

 Achieved MIC (n = 8,390)

1.00 (reference)

 Did not achieve MIC (n = 822)

3.78 (1.75 to 8.14)

HOOS-12 Summary

 

 Achieved MIC (n = 8,377)

1.00 (reference)

 Did not achieve MIC (n = 835)

3.82 (1.76 to 8.25)

EQ-5D-5L utility score

 

 Achieved MIC (9,077)

1.00 (reference)

 Did not achieve MIC (n = 10,019)

2.54 (1.56 to 4.14)

EQ VAS

 

 Achieved MIC (n = 10,922)

1.00 (reference)

 Did not achieve MIC (n = 7,903)

1.45 (0.93 to 2.23)

  1. EQ-5D-5L: Euroqol 5-dimension quality of life index; EQ VAS: Euroqol Health Today Visual Analogue Scale; HOOS-12: 12-item Hip disability and Osteoarthritis Outcome Score; MIC: minimal important change; VAS: visual analogue scale
  2. *Relative risk > 1 indicates a significant increase in the likelihood of revision hip replacement for patients who did not achieve clinically important improvement, compared to those who did
  3. Thresholds for clinically important improvement were based on the published MIC for each instrument: hip pain VAS (2 points), Oxford Hip Score (12.4 points), HOOS-12 pain (19.2 points), HOOS-12 function (15.7 points), HOOS-12 quality of life (17.2 points), HOOS-12 summary (17.9 points), EQ-5D-5L utility score (0.41 units), and EQ VAS (9.34 points)
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