Skip to main content

Table 5 Hip – the SRM, SES, and RI (with 95% CIs) for the OHS and the EQ-5D-3L (by the transition)

From: Assessing responsiveness of the EQ-5D-3L, the Oxford Hip Score, and the Oxford Knee Score in the NHS patient-reported outcome measures

  Total Much better A little better About the same A little worse Much worse
OHS [0, 48] Change N 181,424 155,899 15,565 3891 2382 1633
(Post-op. mean) 39.3 41.3 28.8 24.2 21.6 14.3
(Pre-op. mean) 18.2 18.3 17.3 17.8 18.9 16.7
Mean (SD) 21.1 (9.9) 22.9 (8.6) 11.5 (7.8) 6.3 (8.0) 2.7 (7.6) − 2.3 (8.3)
Meanchange score/SDchange score 2.1 (2.1, 2.1) 2.7 (2.7, 2.7) 1.5 (1.5, 1.5) 0.8 (0.8, 0.8) 0.4 (0.3, 0.4) − 0.3 (− 0.3, − 0.2)
SRM [Eq. 1] 1.8 (1.8, 1.8)a 2.3 (2.3, 2.3) 1.6 (1.5, 1.6) 0.9 (0.8, 0.9) 0.4 (0.3, 0.4) − 0.3 (− 0.3, − 0.2)
SES [Eq. 2] 2.8 (2.8, 2.8)b 2.9 (2.9, 2.9) 1.7 (1.7, 1.7) 1.4 (1.3, 1.4) 1.0 (1.0, 1.1) 1.1 (1, 1.2)
RI [Eq. 3] 0.6 (0.6, 0.7)c      
EQ-5D-3L [− 0.59, 1] Change N 171,423 147,638 14,577 3625 2216 1493
(Post-op. mean) 0.8 0.8 0.6 0.5 0.4 0.2
(Pre-op. mean) 0.4 0.4 0.3 0.3 0.4 0.3
Mean (SD) 0.4 (0.3) 0.5 (0.3) 0.3 (0.3) 0.2 (0.3) 0.1 (0.3) − 0.1 (0.3)
Meanchange score/SDchange score 1.3 (1.3, 1.3) 1.4 (1.4, 1.5) 0.8 (0.8, 0.9) 0.5 (0.4, 0.5) 0.2 (0.1, 0.2) − 0.3 (− 0.4, − 0.3)
SRM [Eq. 1] 1.1 (1.1, 1.1) 1.2 (1.2, 1.2) 0.8 (0.8, 0.8) 0.5 (0.5, 0.5) 0.2 (0.1, 0.2) − 0.3 (− 0.4, − 0.3)
SES [Eq. 2] 1.6 (1.6, 1.6) 1.6 (1.6, 1.6) 1.4 (1.4, 1.4) 1.3 (1.3, 1.3) 1.1 (1.1, 1.1) 1.2 (1.1, 1.3)
RI [Eq. 3] 0.3 (0.3, 0.4)      
  1. aThe SRM [Eq. 1] of the total OHS = \( \frac{{\mathrm{Mean}}_{\mathrm{change}\ \mathrm{score}}/{\mathrm{SD}}_{\mathrm{change}\ \mathrm{score}}}{\surd 2\times \surd \left(1-r\right)}=\frac{2.1}{\surd 2\times \surd \left(1-0.32\right)}=1.8 \)
  2. bThe SES [Eq. 2] of the total OHS = \( \frac{{\mathrm{Mean}}_{\mathrm{pre}-\mathrm{op}.\mathrm{score}}-{\mathrm{Mean}}_{\mathrm{post}-\mathrm{op}.\mathrm{score}\ \left(\mathrm{of}\ \mathrm{the}\ \mathrm{success}\ \mathrm{level}\right)}}{{\mathrm{SD}}_{\mathrm{pre}-\mathrm{op}.\mathrm{score}\ \left(\mathrm{of}\ \mathrm{the}\ \mathrm{success}\ \mathrm{level}\right)}}=\frac{18.2-40.46}{7.87}=\left|2.83\right|=2.8 \)
  3. where 18.2 is pre-op. mean of the OHS (Table 5), 40.46 (7.42) is post-op. mean (SD), and 17.87 (7.87) is pre-op. of mean (SD) of the total improved subjects (N = 169,142); 40.46 of the post-op. mean and 7.87 of the pre-op. SD were used in this case
  4. cThe RI [Eq. 3] of the total OHS = \( \frac{{\mathrm{MCID}}_{\mathrm{anchor}-\mathrm{based}}}{{\mathrm{SD}}_{\mathrm{change}\ \mathrm{score}\ \left(\mathrm{of}\ \mathrm{the}\ \mathrm{stable}\ \mathrm{level}\right)}}=\frac{{\mathrm{Mean}}_{\mathrm{change}\ \mathrm{score}}\ \mathrm{of}\ \mathrm{A}\ \mathrm{little}\ \mathrm{better}\ \mathrm{vs}.\mathrm{About}\ \mathrm{the}\ \mathrm{same}\ }{{\mathrm{SD}}_{\mathrm{change}\ \mathrm{score}\ \left(\mathrm{of}\ \mathrm{the}\ \mathrm{stable}\ \mathrm{level}\right)}}=\frac{5.15}{7.97}=0.6 \)
  5. where the mean change of a little better vs. about the same is 5.15, and the mean (SD) of about the same is 6.34 (7.97)