Introduction
Methods
Sample
Questionnaires
Sample size
Statistical analysis
Results
Patient characteristics
Characteristic | Hip replacement | Knee replacement | ||
---|---|---|---|---|
Sample | Population | Sample | Population | |
Sex: female (%) | 136 (67) | (61) | 152 (61) | (57) |
Age—mean (SD) | 69.1 (12.4) | 67.7 | 68.7 (9.0) | 68.7 |
Living arrangements (%) | ||||
With family/friends | 65 | 72 | 70 | 75 |
Alone | 34 | 28 | 29 | 25 |
Other | 1 | 0 | 1 | 0 |
Duration of symptoms (%) | ||||
0–5 year | 79 | 81 | 45 | 57 |
> 5 years | 21 | 19 | 55 | 44 |
Primary operation (%) | 91 | 90 | 90 | 92 |
Disease-specific PROM Q1—mean (SD) | 15.1 (8.7) | 18.2 | 17.4 (8.2) | 19.3 |
EQ-5D-3L Q1—mean (SD) | 0.24 (0.33) | 0.36 | 0.35 (0.32) | 0.43 |
Comparison between retrospective and contemporary PROMs
PROM | Mean Q1:QR | Mean difference (95% CI) | p value | ICC absolute agreement (95% CI) | ICC consistency (95% CI) |
---|---|---|---|---|---|
OHS | 15.07:14.56 | 0.51 (− 0.19 to 1.23) | 0.15 | 0.82 (0.77–0.86) | 0.82 (0.77–0.86) |
OKS | 17.36:17.02 | 0.34 (− 0.30 to 0.98) | 0.29 | 0.82 (0.77–0.85) | 0.82 (0.77–0.85) |
Hip EQ-5D | 0.24:0.22 | 0.02 (− 0.02 to 0.06) | 0.3 | 0.62 (0.53–0.69) | 0.62 (0.56–0.69) |
Knee EQ-5D | 0.35:0.32 | 0.03(− 0.01 to 0.07) | 0.16 | 0.60 (0.51–0.67) | 0.60 (0.51–0.67) |
Prediction of contemporary using retrospective PROMs scores
PROM | Pearson correlation coefficient (r) | Mean absolute error | Coefficient B (95% CI) |
---|---|---|---|
Oxford Hip Score | 0.82 | 3.89 | 0.85 (0.77–0.94) |
Oxford Knee Score | 0.82 | 3.68 | 0.84 (0.76–0.91) |
Hip EQ-5D | 0.58 | 0.20 | 0.62 (0.50–0.73) |
Knee EQ-5D | 0.56 | 0.21 | 0.59 (0.48–0.70) |
Influences on relationship between contemporary and retrospective PROMs
Patient characteristic | Hip replacement (OHS) | Knee replacement (OKS) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
n (%) | Mean Q1:QR | Mean difference | Adjusted difference | p value | n (%) | Mean Q1-QR | Mean difference | Adjusted difference | p value | |
SES (quintiles) | *Adjusted by age | *Adjusted by age | ||||||||
1 (Least deprived) | 15 (7.4) | 15.8–17.0 | − 1.13 | − 0.72 (− 3.64 to 2.20) | 26 (10.6) | 18.1–20.5 | − 2.35 | − 1.74 (− 4.18 to 0.65) | ||
2 | 36 (17.7) | 15.1–13.3 | 1.89 | 2.14 (0.01 to 4.29) | 43 (17.6) | 19.4–18.3 | 1.02 | 1.46 (− 0.60 to 3.53) | ||
3 | 57 (27.9) | 14.8–14.9 | − 0.14 | Reference group | 0.16 | 48 (19.6) | 16.1–16.5 | − 0.31 | Reference group | 0.10 |
4 | 54 (26.5) | 16.4–15.2 | 1.25 | 1.44 (− 0.44 to 3.34) | 69 (28.2) | 17.4–16.9 | 0.52 | 0.85 (− 1.92 to 1.75) | ||
5 (Most deprived) | 42 (20.6) | 13.5–13.4 | 0.14 | 0.26 (− 1.76 to 2.28) | 58 (23.7) | 14.7–15.1 | − 0.36 | − 0.81 (− 2.73 to 1.11) | ||
Age (years) | *Adjusted by SES | *Adjusted by SES | ||||||||
≤ 60 | 49 (24) | 16.3–15.8 | 0.53 | − 0.27 (− 2.09 to 1.53) | 43 (18) | 16.9–15.3 | 1.62 | 2.00 (0.29 to 3.73) | ||
61–75 | 85 (42) | 15.2–14.2 | 1.06 | Reference group | 0.43 | 137 (57) | 17.9–18.6 | − 0.72 | Reference group | 0.07 |
> 75 | 70 (34) | 14.1–14.1 | 0.14 | − 1.05 (− 2.67 to 0.56) | 59 (25) | 14.9–14.7 | 0.23 | − 0.84 (− 0.67 to 2.37) |
Patient characteristic | Hip replacement (EQ-5D-3L index) | Knee replacement (EQ-5D-3L index) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
n (%) | Mean Q1:QR | Mean difference | Adjusted difference | p value | n (%) | Mean Q1-QR | Mean difference | Adjusted difference | p value | |
SES (quintiles) | *Adjusted by age | *Adjusted by age | ||||||||
1 (Least deprived) | 19 (8.6) | 0.17–0.29 | − 0.12 | − 0.08 (− 0.25 to 0.09) | 28 (11) | 0.33–0.41 | − 0.07 | − 0.08(− 0.22 to 0.07) | ||
2 | 40 (18.2) | 0.22–0.17 | 0.05 | 0.08 (− 0.05 to 0.21) | 45 (17.7) | 0.39–0.39 | 0 | − 0.02 (− 0.15 to 0.10) | ||
3 | 62 (28.2) | 0.22–0.25 | − 0.02 | Reference group | 0.39 | 50 (19.7) | 0.32–0.29 | 0.02 | Reference group | 0.12 |
4 | 55(25) | 0.28–0.28 | − 0.002 | 0.03 (− 0.09 to 0.14) | 71 (28.0) | 0.31–0.33 | − 0.02 | − 0.05 (− 0.16 to 0.06) | ||
5 (Most deprived) | 44 (20) | 0.17–0.14 | 0.03 | 0.04 (− 0.08 to 0.17) | 60 (23.6) | 0.32–0.23 | − 0.09 | 0.06 (− 0.06 to 0.18) | ||
Age (years) | *Adjusted by SES | *Adjusted by SES | ||||||||
≤ 60 | 51 (23.2) | 0.30–0.29 | 0.01 | − 0.02 (− 0.13 to 0.09) | 46 (18.1) | 0.26–0.18 | 0.07 | 0.09 (− 0.01 to 0.20) | ||
61–75 | 95 (43.2) | 0.24–0.21 | 0.03 | Reference group | 0.23 | 147(57.9) | 0.35–0.39 | − 0.04 | Reference group | 0.04 |
> 75 | 74 (33.6) | 0.14–0.20 | − 0.06 | − 0.08 (− 0.18 to 0.01) | 61 (24) | 0.34–0.26 | 0.08 | 0.10 (0.01 to 0.20) |