Table 3.
MID values of knee osteoarthritis outcome tools derived using the anchor method
| Outcome tools | Score | Median | Minimum | Maximum | Number of estimates | Study |
| KOOS-pain | 100=best | 11.8 | 4 | 17 | 13 | Mills, 2016; Mostafaee, 202115 39 |
| KOOS-activities of daily living | 100=best | 2.5 | −1.5 | 15.5 | 7 | Mills, 2016; Mostafaee, 202115 39 |
| KOOS-quality of life | 100=best | 6.5 | 3 | 12.5 | 7 | Mills, 2016; Mostafaee, 202115 39 |
| KOOS-sports/recreation | 100=best | 17.5 | 1 | Mostafaee, 202139 | ||
| KOOS-symptoms | 100=best | 12.5 | 1 | Mostafaee, 202139 | ||
| KOS-activities of daily living | 100=best | 6.4 | 2.2 | 10.6 | 6 | Williams, 201242 |
| LEFS | 100=best | 6.9 | 0.6 | 15.6 | 6 | Williams, 201242 |
| PROMIS Short Forms-physical function* | 100=worst | 4.5 | 5.3 | NR | Lee, 201744 | |
| PROMIS Short Forms-pain interference* | 100=worst | 4.2 | 4.2 | NR | Lee, 201744 | |
| PROMIS Short Forms-depression* | 100=worst | 6 | 6.2 | NR | Lee, 201744 | |
| PROMIS Short Forms- anxiety* | 100=worst | 4.5 | 6.6 | NR | Lee, 201744 | |
| WOMAC-pain | 100=best | 8.7 | 7.1 | 21 | 3 | Angst, 201837 |
| WOMAC-function | 100=best | 14.5 | 11.3 | 14.9 | 3 | Angst, 201837 |
| WOMAC-stiffness | 100=best | 20.2 | 16.2 | 23.8 | 3 | Angst, 201837 |
| WOMAC-standing/walking | 100=best | 8.1 | 5.9 | 10.2 | 2 | Angst, 201837 |
| WOMAC-total | 100=best | 6.8 | 1.6 | 16.8 | 8 | Williams, 2012; Hmamouchi, 201238 42 |
| SF-36-bodily pain | 100=best | 9.3 | 8.2 | 10.4 | 2 | Angst, 201837 |
| SF-36-physical function | 100=best | 4.0 | 3.8 | 4.2 | 2 | Angst, 201837 |
| SF-36-role-physical | 100=best | 8.5 | 7.5 | 9.5 | 2 | Angst, 201837 |
| SF-36-vitality | 100=best | 4.5 | 4.16 | 4.9 | 2 | Angst, 201837 |
| SF-36-social function | 100=best | 4.8 | 2.6 | 7.0 | 2 | Angst, 201837 |
| SF-36-mental health | 100=best | 4.1 | 2.9 | 5.2 | 2 | Angst, 201837 |
| SF-36-general health | 100=best | 6.6 | 6 | 7.2 | 2 | Angst, 201837 |
| Estimates based on low-quality studies | ||||||
| DAP | 100=worst | 24 | 1 | Klokker, 201636 | ||
| ICOAP-pain | 100=worst | 7.8 | 1 | Harris, 201335 | ||
| KOOS-PS | 100=worst | 7.8 | 1 | Harris, 201335 | ||
| OKS-pain | 100=best | 14.3 | 1 | Harris, 201335 | ||
| OKS-function | 100=best | 9.5 | 1 | Harris, 201335 | ||
| OKS-summary | 100=best | 6.4 | 1 | Harris, 201335 | ||
All the scores are from 0 to 100.
The median estimates are shaded in blue.
Estimates based on low-quality studies are shaded in grey.
*Estimates were reported as a range.
DAP, Dynamic Weight-Bearing Assessment of Pain; ICOAP, Intermittent and Constant Osteoarthritis Pain; KOOS, Knee injury and Osteoarthritis Outcome Score; KOOS-PS, Knee injury and Osteoarthritis Outcome Score Physical Function Short form; KOS, Knee Outcome Survey; LEFS, Lower Extremity Functional Scale; MID, minimal important difference; NR, not reported; OA, osteoarthritis; OKS, Oxford Knee Score; PROMIS, Patient-Reported Outcome Measurement Information SystemS; SF-36, 36-item Short Form health survey; WOMAC, Western Ontario and McMaster Universities Arthritis Index.