Table 2 Medians and quartiles for the distribution of the pre-and postoperative WOMAC index and EuroQuol-5D utility index [%] in patients undergoing total knee arthroplasty, their respective intraindividual change [%] with p-values derived from sign tests, the resulting gain in patient quality of life [QALYs] and the marginal cost effectiveness ratio [€/QALY] from the health care insurers' perspective
From: Clinical benefit and cost effectiveness of total knee arthroplasty in the older patient
Median | Q1 -Q3 | p(sign test) | |
|---|---|---|---|
WOMAC pre | 41% | 34 - 47% | |
WOMAC post | 81% | 64 - 88% | |
WOMAC change | 38% | 25 - 45% | p < 0.001 |
EQ-5D pre | 40% | 32 - 54% | |
EQ-5D post | 70% | 65 - 78% | |
EQ-5D change | 30% | 15 - 40% | p = 0.008 |
WOMAC based gain | 4.59 QALYs | 2.39 - 6.21 QALYs | |
EQ-5D based gain | 2.93 QALYs | 1.75 - 5.59 QALYs | |
WOMAC based | 1795 | 1588 - 3288 | |
marginal costs | €/QALY | €/QALY | |
EQ-5D based | 3064 | 1613 - 5291 | |
marginal costs | €/QALY | €/QALY |