Effects of ordinal scores on calculations of MCID.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|
| Raw Score | HAQ-8 | Increment on HAQ-8 (ordinal scale) | Location | Metric-8 | Increment on Metric-8 (metric scale) | ↑ | ↓ |
| 0 | 0.000 | −4.777 | 0.000 | 2 | |||
| 1 | 0.125 | 0.125 | −3.911 | 0.260 | 0.260 | 1 | 4 |
| 2 | 0.250 | 0.125 | −3.280 | 0.449 | 0.189 | 2 | 5 |
| 3 | 0.375 | 0.125 | −2.821 | 0.587 | 0.138 | 3 | 5 |
| 4 | 0.500 | 0.125 | −2.442 | 0.701 | 0.114 | 4 | 6 |
| 5 | 0.625 | 0.125 | −2.108 | 0.801 | 0.100 | 4 | 6 |
| 6 | 0.750 | 0.125 | −1.799 | 0.894 | 0.093 | 5 | 6 |
| 7 | 0.875 | 0.125 | −1.505 | 0.982 | 0.088 | 5 | 6 |
| 8 | 1.000 | 0.125 | −1.220 | 1.068 | 0.086 | 6 | 6 |
| 9 | 1.125 | 0.125 | −0.939 | 1.152 | 0.084 | 6 | 6 |
| 10 | 1.250 | 0.125 | −0.662 | 1.236 | 0.083 | 6 | 6 |
| 11 | 1.375 | 0.125 | −0.386 | 1.318 | 0.083 | 6 | 6 |
| 12 | 1.500 | 0.125 | −0.111 | 1.401 | 0.083 | 6 | 6 |
| 13 | 1.625 | 0.125 | 0.166 | 1.484 | 0.083 | 6 | 5 |
| 14 | 1.750 | 0.125 | 0.447 | 1.569 | 0.084 | 6 | 5 |
| 15 | 1.875 | 0.125 | 0.738 | 1.656 | 0.087 | 6 | 5 |
| 16 | 2.000 | 0.125 | 1.043 | 1.747 | 0.092 | 6 | 4 |
| 17 | 2.125 | 0.125 | 1.369 | 1.845 | 0.098 | 6 | 4 |
| 18 | 2.250 | 0.125 | 1.721 | 1.951 | 0.106 | 5 | 4 |
| 19 | 2.375 | 0.125 | 2.105 | 2.066 | 0.115 | 5 | 3 |
| 20 | 2.500 | 0.125 | 2.526 | 2.193 | 0.126 | 4 | 3 |
| 21 | 2.625 | 0.125 | 2.999 | 2.335 | 0.142 | 4 | 2 |
| 22 | 2.750 | 0.125 | 3.553 | 2.501 | 0.166 | 3 | 2 |
| 23 | 2.875 | 0.125 | 4.276 | 2.718 | 0.217 | 3 | 1 |
| 24 | 3.000 | 0.125 | 5.216 | 3.000 | 0.282 | 2 | |
Columns 7 and 8 show the change in raw score of HAQ-8 needed to achieve a 0.5-point change in HAQ-8, for improvement (↑) and deterioration (↓), respectively. HAQ: Health Assessment Questionnaire; location: location on the metric scale (in logits); Metric-8: HAQ-8 metric equivalent; MCID: minimal clinically important differences.