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Table 4 Graded Response Model slope (a) and location (b) parameters for items comprising the 9-item ISS

From: Unpacking the impact of chronic pain as measured by the impact stratification score

  Slope Location parameters
Item a b1 b2 b3 b4 b5 b6 b7 b8 b9 b10
1. Chores 1.75 -0.79 0.58 1.97 3.02       
2. Stairs 1.43 -0.21 1.14 2.39 3.38       
3. Walk15 1.60 0.44 1.48 2.51 3.43       
4. Errands 1.98 0.26 1.49 2.75 4.07       
5. Interfere daily 4.28 -0.98 0.32 1.31 2.30       
6. Interfere home 7.20 -0.74 0.36 1.17 2.00       
7. Interfere social 3.22 -0.08 0.81 1.67 2.41       
8. Interfere chores 4.67 -0.56 0.54 1.39 2.07       
9. Pain intensity 1.86 -2.73 -1.57 -0.71 -0.07 0.44 0.96 1.61 2.44 3.55 4.54