Table 2 Item parameters for the SDM-Q9
Items | Discrimination parameter | Requirement parameters | ||||
|---|---|---|---|---|---|---|
a | b1 | b2 | b3 | b4 | b5 | |
1. My doctor made clear that a decision needs to be made | 2.39 | -2.14 | -1.79 | -1.35 | -0.68 | 0.27 |
2. My doctor wanted to know exactly how I want to be involved | 3.33 | -2.03 | -1.72 | -1.29 | -0.56 | 0.30 |
3. My doctor told me that there are different options for treating my medical conditions | 4.05 | -1.81 | -1.42 | -1.01 | -0.51 | 0.20 |
4. My doctor precisely explained the advantages and disadvantages of the treatment options | 4.13 | -1.69 | -1.43 | -0.85 | -0.31 | 0.38 |
5. My doctor helped me understand all the information | 3.92 | -2.02 | -1.69 | -1.25 | -0.74 | 0.05 |
6. My doctor asked me what treatment option I prefer | 4.18 | -1.72 | -1.45 | -0.93 | -0.39 | 0.29 |
7. My doctor and I thoroughly weighed the different treatment options | 4.22 | -1.63 | -1.39 | -0.73 | -0.22 | 0.46 |
8. My doctor and I selected a treatment option together | 4.48 | -1.63 | -1.44 | -0.91 | -0.47 | 0.25 |
9. My doctor and I reached an agreement on how to proceed | 3.30 | -1.94 | -1.65 | -1.31 | -0.82 | -0.11 |