Table 3.
Description of EQ-5D-5L domains and VAS as well as OKS in the external validation sample
| Whole external validation sample | TKR | |||||||
|---|---|---|---|---|---|---|---|---|
| No | Yes | |||||||
| Not indicated | Indicated | |||||||
| (n = 115) | (n = 66) | (n = 21) | (n = 28) | |||||
| Mobility | ||||||||
| L1 | 45 | 39.1% | 31 | 47% | – | 0% | 14 | 50% |
| L2 | 18 | 15.7% | 14 | 21.2% | – | 0% | 4 | 14.3% |
| L3 | 30 | 26.1% | 18 | 27.3% | 4 | 19.0% | 8 | 28.6% |
| L4 | 17 | 14.8% | 3 | 4.5% | 12 | 57.1% | 2 | 7.1% |
| L5 | 5 | 4.3% | – | 0% | 5 | 23.8% | – | 0% |
| Self-care | ||||||||
| L1 | 66 | 57.4% | 49 | 74.2% | – | 0% | 17 | 60.7% |
| L2 | 23 | 20% | 12 | 18.2% | 5 | 23.8% | 6 | 21.4% |
| L3 | 12 | 10.4% | 4 | 6.1% | 5 | 23.8% | 3 | 10.7% |
| L4 | 11 | 9.6% | 1 | 1.5% | 8 | 38.1% | 2 | 7.1% |
| L5 | 3 | 2.6% | – | 0% | 3 | 14.3% | – | 0% |
| Usual activities | ||||||||
| L1 | 35 | 30.4% | 24 | 36.4% | – | 0% | 11 | 39.3% |
| L2 | 31 | 27% | 23 | 34.8% | – | 0% | 8 | 28.6% |
| L3 | 28 | 24.3% | 17 | 25.8% | 5 | 23.8% | 6 | 21.4% |
| L4 | 14 | 12.2% | 2 | 3.0% | 10 | 47.6% | 2 | 7.1% |
| L5 | 7 | 6.1% | – | 0% | 6 | 28.6% | 1 | 3.6% |
| Pain/discomfort | ||||||||
| L1 | 19 | 16.5% | 9 | 13.6% | – | 0% | 10 | 35.7% |
| L2 | 37 | 32.2% | 29 | 43.9% | – | 0% | 8 | 28.6% |
| L3 | 38 | 33% | 24 | 36.4% | 5 | 23.8% | 9 | 32.1% |
| L4 | 11 | 9.6% | 2 | 3% | 9 | 42.9% | – | 0% |
| L5 | 10 | 8.7% | 2 | 3% | 7 | 33.3% | 1 | 3.6% |
| Anxiety/depression | ||||||||
| L1 | 44 | 38.3% | 24 | 36.4% | 3 | 14.3% | 17 | 60.7% |
| L2 | 35 | 30.4% | 22 | 33.3% | 5 | 23.8% | 8 | 28.6% |
| L3 | 28 | 24.3% | 18 | 27.3% | 9 | 42.9% | 1 | 3.6% |
| L4 | 6 | 5.2% | 1 | 1.5% | 3 | 14.3% | 2 | 7.1% |
| L5 | 2 | 1.7% | 1 | 1.5% | 1 | 4.8% | – | 0% |
| EQ-5D VAS | 69.3 ± 21.3 | 74.3 ± 17.8 | 47.4 ± 19.9 | 73.9 ± 19.9 | ||||
| Egypt utility | 0.52 ± 0.47 | 0.68 ± 0.24 | − 0.22 ± 0.37 | 0.69 ± 0.41 | ||||
| Total OKS | 30.6 ± 12.4 | 34.8 ± 7.83 | 10.8 ± 5.63 | 35.5 ± 10.3 | ||||
| Usual level of pain | 1.50 ± 1.40 | 1.45 ± 1.17 | 0.095 ± 0.3 | 2.68 ± 1.39 | ||||
| Trouble with washing and drying | 3.19 ± 1.19 | 3.67 ± 0.69 | 1.33 ± 0.97 | 3.46 ± 0.92 | ||||
| Trouble with transport | 2.56 ± 1.18 | 2.92 ± 0.90 | 1.10 ± 0.94 | 2.79 ± 1.10 | ||||
| Walking time before severe pain | 2.93 ± 1.13 | 3.52 ± 0.75 | 1.43 ± 0.75 | 2.68 ± 0.98 | ||||
| Pain on standing up from sitting | 2.48 ± 1.19 | 2.64 ± 1.00 | 1.00 ± 0.71 | 3.21 ± 0.96 | ||||
| Limping | 2.83 ± 1.25 | 3.18 ± 0.89 | 1.19 ± 0.99 | 3.21 ± 1.20 | ||||
| Difficulty kneeling | 2.08 ± 1.49 | 2.38 ± 1.37 | 0.57 ± 0.87 | 2.50 ± 1.45 | ||||
| Pain at night | 2.73 ± 1.33 | 3.06 ± 1.16 | 1.00 ± 0.89 | 3.25 ± 0.84 | ||||
| Pain interferes with work | 2.39 ± 1.30 | 2.68 ± 1.13 | 0.72 ± 0.46 | 2.96 ± 1.07 | ||||
| Sense of knee instability | 2.80 ± 1.26 | 3.30 ± 0.82 | 0.95 ± 0.86 | 3.00 ± 1.12 | ||||
| Can do household shopping alone | 2.94 ± 1.37 | 3.55 ± 0.89 | 0.95 ± 1.20 | 3.00 ± 0.99 | ||||
| Trouble walking downstairs | 2.16 ± 1.28 | 2.45 ± 1.04 | 0.48 ± 0.75 | 2.71 ± 1.08 | ||||
Values are number and % or mean ± SD
OKS is Oxford knee score, each question ranges (0–4), (0) means severe, (4) means very mild
L level of the domain of EQ-5D-5L, each domain ranges (1–5), (1) means no problems, (5) means unable to / extreme problems
VAS is a visual analogue scale, it ranges (0–100), (0) means the worst health you can imagine, (100) means the best health you can imagine
Egypt utility ranges from − 0.964 for the worst health state (55555) to 1 for full health (11111)
% are estimated from columns