MMRI-R Cut-Point | Sensitivity | Specificity | PVP | PVN | PSI |
---|
0 | 100.00 | Â | 23.15 | Â | Â |
6 | 99.75 | 1.81 | 23.43 | 96.01 | 0.19 |
11 | 98.55 | 10.42 | 24.89 | 95.99 | 0.21 |
16 | 94.69 | 25.09 | 27.57 | 94.01 | 0.22 |
21 | 85.91 | 45.60 | 32.23 | 91.48 | 0.24 |
26 | 70.64 | 67.47 | 39.54 | 88.41 | 0.28 |
31 | 51.44 | 83.24 | 48.03 | 85.06 | 0.33 |
36 | 34.38 | 92.23 | 57.14 | 82.35 | 0.39 |
41 | 20.65 | 96.82 | 66.13 | 80.20 | 0.46 |
46 | 11.28 | 98.89 | 75.30 | 78.73 | 0.56 |
51 | 5.60 | 99.67 | 83.73 | 77.81 | 0.62 |
56 | 2.58 | 99.91 | 89.93 | 77.30 | 0.67 |
61 | 1.01 | 99.97 | 90.99 | 77.03 | 0.68 |
66 | 0.31 | 99.99 | 93.94 | 76.91 | 0.71 |
71 | 0.05 | 100.00 | 100.00 | 76.86 | 0.77 |
- Table notes:
- • Sensitivity is the probability of observing an MMRI-R score greater than or equal to the cut-point given mortality within six months.
- • Specificity is the probability of observing an MMRI-R score less than the cut-point given survival beyond six months.
- • Predictive value positive (PVP) and is the probability of dying within six months given an MMRI-R score is greater than or equal to the cut point.
- • Predictive value negative (PVN) and is the probability of surviving beyond six months given an MMRI-R score less than the cut-point.
- • The appropriateness of PVP and PVN depends on having a good estimate of population prevalence, in this case the prevalence of six month mortality.
- • For ease of interpretation all probabilities were converted to percentages.
- • Predictive Summary Index (PSI), calculated as PVP + PVN -100, is a overall measure of the gain in certainty associated with using the MMRI-R to make decisions. The practical range of PSI values is 0 to 1 with 0 reflecting a useless test and PSI = 1 for a test yielding perfect predictions.