Table 2 Methods used to calculate minimal clinically important difference
Citation | Test | Method | Anchor question | Transitional scale |
|---|---|---|---|---|
Quintana et al., 2006 [16] | WOMAC and SF-36 | Mean change | Not specified | 5-point scale |
Escobar et al., 2007 [14] | WOMAC and SF-36 | Mean change | Not specified | 5-point scale |
Chesworth et al., 2008 [13] | WOMAC* | ROC | “Compared to when they went on the wait list for surgery, they were better, worse or the same” | 15-point scale |
Escobar et al., 2013 [17] | WOMAC* | Mean change ROC | “Compared to before surgery, how would you rate pain (functional limitation) in the same knee?” “Was surgery worthwhile?” “What is your global level of satisfaction with surgical management?” | 5-point scale |
Clement et al., 2014 [18] | OKS and SF-12 PCS | Linear regression analysis | “How well did the surgery relieve pain in your affected joint?” “How well did the surgery increase your ability to perform regular activities?” | 5-point scale |
Escobar et al., 2014 [15] | WOMAC* | Mean change | Not specified | 5-point scale |
Maratt et al., 2015 [12] | WOMAC* | ROC | “How much did your knee surgery improve the quality of your life? | 6-point scale |
Beard et al., 2015 [28] | OKS | Mean difference Mean change and ROC | “Overall, how are your problems now, compared to before your operation?” | 5-point scale |
Lee et al., 2017 [21] | KSS | Linear regression analysis | How would you rate the overall results of the surgery for your knee condition?” | 6-point scale |
Ingelsrud et al., 2018 [29] | OKS | Mean change Logistic regression and ROC | “How are your knee problems now compared to prior to operation?” | 7-point scale |
Lizaur-Utrilla et al., 2019 [23] | KSS | Mean difference ROC and 0.5 SD | “Compared to before surgery, how would you rate the pain in your knee and the ability to perform regular activities now? | 5-point scale |
Clement et al., 2019 [25] | SF-12 | Mean difference ROC | “How much did the knee replacement surgery improve the quality of your life?” | 5-point scale |
Kiran et al., 2014 [19] | OKS | 0.5 SD | Distribution-based method | – |
Keurentjes et al. 2014 [26] | SF-36 | 0.8 SD | Distribution-based method | – |
Kiran, et al., 2015 [27] | OKS | 0.5 SD | Distribution-based method | – |
Bin Abd Razak et al., 2016 [20] | OKS and SF-36 PCS | 0.5 SD | Distribution-based method | – |
Berliner, et al., 2017 [22] | SF-12 PCS | 0.5 SD | Distribution-based method | – |
Blevins et al., 2019 [24] | SF-12 | 0.5 SD | Distribution-based method | – |