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. Author manuscript; available in PMC: 2009 Oct 14.
Published in final edited form as: J Pain Symptom Manage. 2009 Jul 3;38(4):615–628. doi: 10.1016/j.jpainsymman.2008.11.016

Table 4.

Item Parameter Estimates of IMMPACT Pain Interference Item by Separated Calibration Then Transformed to CORE Pain Item Bank Scale Using Stocking-Lord Method via Common Items

Slope Threshold
1		 Threshold
2		 Threshold
3		 Threshold
4		 Threshold
5		 Threshold
6		 Threshold
7		 Threshold
8		 Threshold
9
   Unique items: IMMPACT Main Survey
Pain interferes day-to-day activity 0–6 5.34 0.02 0.27 0.60 1.02 1.43 1.82
Pain interferes ability to work 0–6 3.78 0.38 0.52 0.70 0.99 1.27 1.56
Pain interferes sat/enjoy in soc/rec acts 0–6 5.12 0.20 0.41 0.65 0.93 1.26 1.69
Pain interferes ability to take part in rec. 0–6 5.09 0.19 0.40 0.67 0.90 1.21 1.64
Pain interferes sat/enjoy in family acts 0–6 4.52 0.34 0.66 0.87 1.11 1.52 1.94
Pain interferes relationship with spouse/fam 0–6 3.23 0.32 0.61 0.93 1.23 1.50 1.96
Pain interferes sat/enjoy from work 0–6 3.62 0.39 0.54 0.76 0.96 1.24 1.60
Pain interferes ability to do house/chores 0–6 4.24 0.10 0.45 0.72 1.02 1.39 1.82
Pain interferes friendship with others 0–6 3.89 0.65 0.94 1.11 1.36 1.67 2.08
Past 4 weeks pain interfered normal work 0–4 3.67 −0.15 0.37 1.09 1.92
   Common items: IMMPACT Main and Pain Module
Surveys, and CORE Pain Item Bank
Pain interferes ability to concentrate 0–41 4.02 0.29 0.85 1.62 2.12
Pain interferes ability to pay attention 0–41 3.79 0.57 1.02 1.77 2.19
Pain interferes ability to think clearly 0–41 3.66 0.54 1.09 1.71 2.36
Pain makes me depressed 0–41 2.35 0.25 0.98 1.60 2.21
Pain interferes my family life 0–41 3.38 0.35 0.75 1.46 2.04
Past week pain interfered: General activity 0–102 4.68 0.07 0.15 0.34 0.57 0.79 1.04 1.23 1.48 1.77
Past week pain interfered: Mood 0–102 3.41 −0.06 0.12 0.31 0.53 0.67 0.92 1.13 1.38 1.74
Past week pain interfered: Walking ability 0–102 2.83 0.43 0.58 0.73 0.85 0.99 1.20 1.39 1.62 1.91
Past week pain interfered: Normal work 0–102 5.13 0.19 0.40 0.53 0.64 0.77 0.96 1.13 1.34 1.58
Past week pain interfered: People relationship 0–102 4.02 0.43 0.62 0.79 0.94 1.08 1.26 1.42 1.62 1.94
Past week pain interfered: Sleep 0–102 2.14 −0.38 −0.07 0.14 0.33 0.52 0.75 0.94 1.20 1.56
Past week pain interfered: Enjoyment of life 0–102 4.59 0.16 0.24 0.44 0.53 0.68 0.89 1.06 1.23 1.48
During past week pain interferes daily acts 1–41 4.96 −1.41 1.01 1.62
Past 4 weeks pain interferes: mood 1–51 3.25 0.07 0.95 1.47 2.29
Past 4 weeks pain interferes: walk or move about 1–51 3.18 0.54 1.05 1.40 2.07
Past 4 weeks pain interferes: sleep 1–51 2.25 0.14 0.58 1.27 1.85
Past 4 weeks pain interferes: normal work 1–51 4.73 0.07 0.74 1.33 1.90
Past 4 weeks pain interferes: recreation 1–51 3.99 −0.04 0.75 1.28 1.79
Past 4 weeks pain interferes: enjoyment life 1–51 4.30 −0.01 0.65 1.27 1.79
1

Common items appear both in IMMPACT Pain Module Survey and CORE Pain Item Bank.

2

Common items appear in IMMPACT Main Survey, IMMPACT Pain Module Survey, and CORE Pain Item Bank.