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Table 5 Graded Response Model slope (a) and location (b) parameters for items comprising the 8-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 1.94 -0.76 0.56 1.89 2.87       
2. Stairs 1.70 -0.20 1.05 2.18 3.06       
3. Walk15 1.93 0.40 1.35 2.29 3.10       
4. Errands 2.43 0.24 1.39 2.54 3.70       
5. Interfere daily 3.29 -1.04 0.34 1.38 2.40       
7. Interfere social 3.16 -0.08 0.83 1.69 2.42       
8. Interfere chores 3.83 -0.58 0.56 1.44 2.13       
9. Pain intensity 1.79 -2.79 -1.61 -0.73 -0.08 0.45 0.97 1.64 2.49 3.63 4.66